nfs_vnops.c revision 1.321
1 /* $NetBSD: nfs_vnops.c,v 1.321 2021/10/20 03:08:18 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nfs_vnops.c 8.19 (Berkeley) 7/31/95 35 */ 36 37 /* 38 * vnode op calls for Sun NFS version 2 and 3 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: nfs_vnops.c,v 1.321 2021/10/20 03:08:18 thorpej Exp $"); 43 44 #ifdef _KERNEL_OPT 45 #include "opt_nfs.h" 46 #include "opt_uvmhist.h" 47 #endif 48 49 #include <sys/param.h> 50 #include <sys/proc.h> 51 #include <sys/kernel.h> 52 #include <sys/systm.h> 53 #include <sys/resourcevar.h> 54 #include <sys/mount.h> 55 #include <sys/buf.h> 56 #include <sys/condvar.h> 57 #include <sys/disk.h> 58 #include <sys/malloc.h> 59 #include <sys/kmem.h> 60 #include <sys/mbuf.h> 61 #include <sys/mutex.h> 62 #include <sys/namei.h> 63 #include <sys/vnode.h> 64 #include <sys/dirent.h> 65 #include <sys/fcntl.h> 66 #include <sys/hash.h> 67 #include <sys/lockf.h> 68 #include <sys/stat.h> 69 #include <sys/unistd.h> 70 #include <sys/kauth.h> 71 #include <sys/cprng.h> 72 73 #ifdef UVMHIST 74 #include <uvm/uvm.h> 75 #endif 76 #include <uvm/uvm_extern.h> 77 #include <uvm/uvm_stat.h> 78 79 #include <miscfs/fifofs/fifo.h> 80 #include <miscfs/genfs/genfs.h> 81 #include <miscfs/genfs/genfs_node.h> 82 #include <miscfs/specfs/specdev.h> 83 84 #include <nfs/rpcv2.h> 85 #include <nfs/nfsproto.h> 86 #include <nfs/nfs.h> 87 #include <nfs/nfsnode.h> 88 #include <nfs/nfsmount.h> 89 #include <nfs/xdr_subs.h> 90 #include <nfs/nfsm_subs.h> 91 #include <nfs/nfs_var.h> 92 93 #include <net/if.h> 94 #include <netinet/in.h> 95 #include <netinet/in_var.h> 96 97 /* 98 * Global vfs data structures for nfs 99 */ 100 int (**nfsv2_vnodeop_p)(void *); 101 const struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = { 102 { &vop_default_desc, vn_default_error }, 103 { &vop_parsepath_desc, genfs_parsepath }, /* parsepath */ 104 { &vop_lookup_desc, nfs_lookup }, /* lookup */ 105 { &vop_create_desc, nfs_create }, /* create */ 106 { &vop_mknod_desc, nfs_mknod }, /* mknod */ 107 { &vop_open_desc, nfs_open }, /* open */ 108 { &vop_close_desc, nfs_close }, /* close */ 109 { &vop_access_desc, nfs_access }, /* access */ 110 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 111 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 112 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 113 { &vop_read_desc, nfs_read }, /* read */ 114 { &vop_write_desc, nfs_write }, /* write */ 115 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 116 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 117 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 118 { &vop_ioctl_desc, genfs_enoioctl }, /* ioctl */ 119 { &vop_poll_desc, genfs_poll }, /* poll */ 120 { &vop_kqfilter_desc, nfs_kqfilter }, /* kqfilter */ 121 { &vop_revoke_desc, genfs_revoke }, /* revoke */ 122 { &vop_mmap_desc, genfs_mmap }, /* mmap */ 123 { &vop_fsync_desc, nfs_fsync }, /* fsync */ 124 { &vop_seek_desc, genfs_seek }, /* seek */ 125 { &vop_remove_desc, nfs_remove }, /* remove */ 126 { &vop_link_desc, nfs_link }, /* link */ 127 { &vop_rename_desc, nfs_rename }, /* rename */ 128 { &vop_mkdir_desc, nfs_mkdir }, /* mkdir */ 129 { &vop_rmdir_desc, nfs_rmdir }, /* rmdir */ 130 { &vop_symlink_desc, nfs_symlink }, /* symlink */ 131 { &vop_readdir_desc, nfs_readdir }, /* readdir */ 132 { &vop_readlink_desc, nfs_readlink }, /* readlink */ 133 { &vop_abortop_desc, genfs_abortop }, /* abortop */ 134 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 135 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 136 { &vop_lock_desc, genfs_lock }, /* lock */ 137 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 138 { &vop_bmap_desc, nfs_bmap }, /* bmap */ 139 { &vop_strategy_desc, nfs_strategy }, /* strategy */ 140 { &vop_print_desc, nfs_print }, /* print */ 141 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 142 { &vop_pathconf_desc, nfs_pathconf }, /* pathconf */ 143 { &vop_advlock_desc, nfs_advlock }, /* advlock */ 144 { &vop_bwrite_desc, genfs_badop }, /* bwrite */ 145 { &vop_getpages_desc, nfs_getpages }, /* getpages */ 146 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 147 { NULL, NULL } 148 }; 149 const struct vnodeopv_desc nfsv2_vnodeop_opv_desc = 150 { &nfsv2_vnodeop_p, nfsv2_vnodeop_entries }; 151 152 /* 153 * Special device vnode ops 154 */ 155 int (**spec_nfsv2nodeop_p)(void *); 156 const struct vnodeopv_entry_desc spec_nfsv2nodeop_entries[] = { 157 { &vop_default_desc, vn_default_error }, 158 GENFS_SPECOP_ENTRIES, 159 { &vop_close_desc, nfsspec_close }, /* close */ 160 { &vop_access_desc, nfsspec_access }, /* access */ 161 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 162 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 163 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 164 { &vop_read_desc, nfsspec_read }, /* read */ 165 { &vop_write_desc, nfsspec_write }, /* write */ 166 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 167 { &vop_fsync_desc, spec_fsync }, /* fsync */ 168 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 169 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 170 { &vop_lock_desc, genfs_lock }, /* lock */ 171 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 172 { &vop_print_desc, nfs_print }, /* print */ 173 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 174 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 175 { NULL, NULL } 176 }; 177 const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc = 178 { &spec_nfsv2nodeop_p, spec_nfsv2nodeop_entries }; 179 180 int (**fifo_nfsv2nodeop_p)(void *); 181 const struct vnodeopv_entry_desc fifo_nfsv2nodeop_entries[] = { 182 { &vop_default_desc, vn_default_error }, 183 GENFS_FIFOOP_ENTRIES, 184 { &vop_close_desc, nfsfifo_close }, /* close */ 185 { &vop_access_desc, nfsspec_access }, /* access */ 186 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 187 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 188 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 189 { &vop_read_desc, nfsfifo_read }, /* read */ 190 { &vop_write_desc, nfsfifo_write }, /* write */ 191 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 192 { &vop_fsync_desc, nfs_fsync }, /* fsync */ 193 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 194 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 195 { &vop_lock_desc, genfs_lock }, /* lock */ 196 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 197 { &vop_strategy_desc, vn_fifo_bypass }, /* strategy */ 198 { &vop_print_desc, nfs_print }, /* print */ 199 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 200 { &vop_bwrite_desc, genfs_badop }, /* bwrite */ 201 { NULL, NULL } 202 }; 203 const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc = 204 { &fifo_nfsv2nodeop_p, fifo_nfsv2nodeop_entries }; 205 206 static int nfs_linkrpc(struct vnode *, struct vnode *, const char *, 207 size_t, kauth_cred_t, struct lwp *); 208 static void nfs_writerpc_extfree(struct mbuf *, void *, size_t, void *); 209 210 /* 211 * Global variables 212 */ 213 extern u_int32_t nfs_true, nfs_false; 214 extern u_int32_t nfs_xdrneg1; 215 extern const nfstype nfsv3_type[9]; 216 217 int nfs_numasync = 0; 218 #define DIRHDSIZ _DIRENT_NAMEOFF(dp) 219 #define UIO_ADVANCE(uio, siz) \ 220 (void)((uio)->uio_resid -= (siz), \ 221 (uio)->uio_iov->iov_base = (char *)(uio)->uio_iov->iov_base + (siz), \ 222 (uio)->uio_iov->iov_len -= (siz)) 223 224 static void nfs_cache_enter(struct vnode *, struct vnode *, 225 struct componentname *); 226 227 static void 228 nfs_cache_enter(struct vnode *dvp, struct vnode *vp, 229 struct componentname *cnp) 230 { 231 struct nfsnode *dnp = VTONFS(dvp); 232 233 if ((cnp->cn_flags & MAKEENTRY) == 0) { 234 return; 235 } 236 if (vp != NULL) { 237 struct nfsnode *np = VTONFS(vp); 238 239 np->n_ctime = np->n_vattr->va_ctime.tv_sec; 240 } 241 242 if (!timespecisset(&dnp->n_nctime)) 243 dnp->n_nctime = dnp->n_vattr->va_mtime; 244 245 cache_enter(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_flags); 246 } 247 248 /* 249 * nfs null call from vfs. 250 */ 251 int 252 nfs_null(struct vnode *vp, kauth_cred_t cred, struct lwp *l) 253 { 254 char *bpos, *dpos; 255 int error = 0; 256 struct mbuf *mreq, *mrep, *md, *mb __unused; 257 struct nfsnode *np = VTONFS(vp); 258 259 nfsm_reqhead(np, NFSPROC_NULL, 0); 260 nfsm_request(np, NFSPROC_NULL, l, cred); 261 nfsm_reqdone; 262 return (error); 263 } 264 265 /* 266 * nfs access vnode op. 267 * For nfs version 2, just return ok. File accesses may fail later. 268 * For nfs version 3, use the access rpc to check accessibility. If file modes 269 * are changed on the server, accesses might still fail later. 270 */ 271 int 272 nfs_access(void *v) 273 { 274 struct vop_access_args /* { 275 struct vnode *a_vp; 276 accmode_t a_accmode; 277 kauth_cred_t a_cred; 278 } */ *ap = v; 279 struct vnode *vp = ap->a_vp; 280 #ifndef NFS_V2_ONLY 281 u_int32_t *tl; 282 char *cp; 283 int32_t t1, t2; 284 char *bpos, *dpos, *cp2; 285 int error = 0, attrflag; 286 struct mbuf *mreq, *mrep, *md, *mb; 287 u_int32_t mode, rmode; 288 const int v3 = NFS_ISV3(vp); 289 #endif 290 int cachevalid; 291 struct nfsnode *np = VTONFS(vp); 292 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 293 294 cachevalid = (np->n_accstamp != -1 && 295 (time_uptime - np->n_accstamp) < nfs_attrtimeo(nmp, np) && 296 np->n_accuid == kauth_cred_geteuid(ap->a_cred)); 297 298 /* 299 * Check access cache first. If this request has been made for this 300 * uid shortly before, use the cached result. 301 */ 302 if (cachevalid) { 303 if (!np->n_accerror) { 304 if ((np->n_accmode & ap->a_accmode) == ap->a_accmode) 305 return np->n_accerror; 306 } else if ((np->n_accmode & ap->a_accmode) == np->n_accmode) 307 return np->n_accerror; 308 } 309 310 #ifndef NFS_V2_ONLY 311 /* 312 * For nfs v3, do an access rpc, otherwise you are stuck emulating 313 * ufs_access() locally using the vattr. This may not be correct, 314 * since the server may apply other access criteria such as 315 * client uid-->server uid mapping that we do not know about, but 316 * this is better than just returning anything that is lying about 317 * in the cache. 318 */ 319 if (v3) { 320 nfsstats.rpccnt[NFSPROC_ACCESS]++; 321 nfsm_reqhead(np, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 322 nfsm_fhtom(np, v3); 323 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 324 if (ap->a_accmode & VREAD) 325 mode = NFSV3ACCESS_READ; 326 else 327 mode = 0; 328 if (vp->v_type != VDIR) { 329 if (ap->a_accmode & VWRITE) 330 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 331 if (ap->a_accmode & VEXEC) 332 mode |= NFSV3ACCESS_EXECUTE; 333 } else { 334 if (ap->a_accmode & VWRITE) 335 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 336 NFSV3ACCESS_DELETE); 337 if (ap->a_accmode & VEXEC) 338 mode |= NFSV3ACCESS_LOOKUP; 339 } 340 *tl = txdr_unsigned(mode); 341 nfsm_request(np, NFSPROC_ACCESS, curlwp, ap->a_cred); 342 nfsm_postop_attr(vp, attrflag, 0); 343 if (!error) { 344 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 345 rmode = fxdr_unsigned(u_int32_t, *tl); 346 /* 347 * The NFS V3 spec does not clarify whether or not 348 * the returned access bits can be a superset of 349 * the ones requested, so... 350 */ 351 if ((rmode & mode) != mode) 352 error = EACCES; 353 } 354 nfsm_reqdone; 355 } else 356 #endif 357 return (nfsspec_access(ap)); 358 #ifndef NFS_V2_ONLY 359 /* 360 * Disallow write attempts on filesystems mounted read-only; 361 * unless the file is a socket, fifo, or a block or character 362 * device resident on the filesystem. 363 */ 364 if (!error && (ap->a_accmode & VWRITE) && 365 (vp->v_mount->mnt_flag & MNT_RDONLY)) { 366 switch (vp->v_type) { 367 case VREG: 368 case VDIR: 369 case VLNK: 370 error = EROFS; 371 default: 372 break; 373 } 374 } 375 376 if (!error || error == EACCES) { 377 /* 378 * If we got the same result as for a previous, 379 * different request, OR it in. Don't update 380 * the timestamp in that case. 381 */ 382 if (cachevalid && np->n_accstamp != -1 && 383 error == np->n_accerror) { 384 if (!error) 385 np->n_accmode |= ap->a_accmode; 386 else if ((np->n_accmode & ap->a_accmode) == ap->a_accmode) 387 np->n_accmode = ap->a_accmode; 388 } else { 389 np->n_accstamp = time_uptime; 390 np->n_accuid = kauth_cred_geteuid(ap->a_cred); 391 np->n_accmode = ap->a_accmode; 392 np->n_accerror = error; 393 } 394 } 395 396 return (error); 397 #endif 398 } 399 400 /* 401 * nfs open vnode op 402 * Check to see if the type is ok 403 * and that deletion is not in progress. 404 * For paged in text files, you will need to flush the page cache 405 * if consistency is lost. 406 */ 407 /* ARGSUSED */ 408 int 409 nfs_open(void *v) 410 { 411 struct vop_open_args /* { 412 struct vnode *a_vp; 413 int a_mode; 414 kauth_cred_t a_cred; 415 } */ *ap = v; 416 struct vnode *vp = ap->a_vp; 417 struct nfsnode *np = VTONFS(vp); 418 int error; 419 420 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 421 return (EACCES); 422 } 423 424 if (ap->a_mode & FREAD) { 425 if (np->n_rcred != NULL) 426 kauth_cred_free(np->n_rcred); 427 np->n_rcred = ap->a_cred; 428 kauth_cred_hold(np->n_rcred); 429 } 430 if (ap->a_mode & FWRITE) { 431 if (np->n_wcred != NULL) 432 kauth_cred_free(np->n_wcred); 433 np->n_wcred = ap->a_cred; 434 kauth_cred_hold(np->n_wcred); 435 } 436 437 error = nfs_flushstalebuf(vp, ap->a_cred, curlwp, 0); 438 if (error) 439 return error; 440 441 NFS_INVALIDATE_ATTRCACHE(np); /* For Open/Close consistency */ 442 443 return (0); 444 } 445 446 /* 447 * nfs close vnode op 448 * What an NFS client should do upon close after writing is a debatable issue. 449 * Most NFS clients push delayed writes to the server upon close, basically for 450 * two reasons: 451 * 1 - So that any write errors may be reported back to the client process 452 * doing the close system call. By far the two most likely errors are 453 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 454 * 2 - To put a worst case upper bound on cache inconsistency between 455 * multiple clients for the file. 456 * There is also a consistency problem for Version 2 of the protocol w.r.t. 457 * not being able to tell if other clients are writing a file concurrently, 458 * since there is no way of knowing if the changed modify time in the reply 459 * is only due to the write for this client. 460 * (NFS Version 3 provides weak cache consistency data in the reply that 461 * should be sufficient to detect and handle this case.) 462 * 463 * The current code does the following: 464 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 465 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 466 * or commit them (this satisfies 1 and 2 except for the 467 * case where the server crashes after this close but 468 * before the commit RPC, which is felt to be "good 469 * enough". Changing the last argument to nfs_flush() to 470 * a 1 would force a commit operation, if it is felt a 471 * commit is necessary now. 472 */ 473 /* ARGSUSED */ 474 int 475 nfs_close(void *v) 476 { 477 struct vop_close_args /* { 478 struct vnodeop_desc *a_desc; 479 struct vnode *a_vp; 480 int a_fflag; 481 kauth_cred_t a_cred; 482 } */ *ap = v; 483 struct vnode *vp = ap->a_vp; 484 struct nfsnode *np = VTONFS(vp); 485 int error = 0; 486 UVMHIST_FUNC("nfs_close"); UVMHIST_CALLED(ubchist); 487 488 if (vp->v_type == VREG) { 489 if (np->n_flag & NMODIFIED) { 490 #ifndef NFS_V2_ONLY 491 if (NFS_ISV3(vp)) { 492 error = nfs_flush(vp, ap->a_cred, MNT_WAIT, curlwp, 0); 493 np->n_flag &= ~NMODIFIED; 494 } else 495 #endif 496 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, curlwp, 1); 497 NFS_INVALIDATE_ATTRCACHE(np); 498 } 499 if (np->n_flag & NWRITEERR) { 500 np->n_flag &= ~NWRITEERR; 501 error = np->n_error; 502 } 503 } 504 UVMHIST_LOG(ubchist, "returning %d", error,0,0,0); 505 return (error); 506 } 507 508 /* 509 * nfs getattr call from vfs. 510 */ 511 int 512 nfs_getattr(void *v) 513 { 514 struct vop_getattr_args /* { 515 struct vnode *a_vp; 516 struct vattr *a_vap; 517 kauth_cred_t a_cred; 518 } */ *ap = v; 519 struct vnode *vp = ap->a_vp; 520 struct nfsnode *np = VTONFS(vp); 521 char *cp; 522 u_int32_t *tl; 523 int32_t t1, t2; 524 char *bpos, *dpos; 525 int error = 0; 526 struct mbuf *mreq, *mrep, *md, *mb; 527 const int v3 = NFS_ISV3(vp); 528 529 /* 530 * Update local times for special files. 531 */ 532 if (np->n_flag & (NACC | NUPD)) 533 np->n_flag |= NCHG; 534 535 /* 536 * if we have delayed truncation, do it now. 537 */ 538 nfs_delayedtruncate(vp); 539 540 /* 541 * First look in the cache. 542 */ 543 if (nfs_getattrcache(vp, ap->a_vap) == 0) 544 return (0); 545 nfsstats.rpccnt[NFSPROC_GETATTR]++; 546 nfsm_reqhead(np, NFSPROC_GETATTR, NFSX_FH(v3)); 547 nfsm_fhtom(np, v3); 548 nfsm_request(np, NFSPROC_GETATTR, curlwp, ap->a_cred); 549 if (!error) { 550 nfsm_loadattr(vp, ap->a_vap, 0); 551 if (vp->v_type == VDIR && 552 ap->a_vap->va_blocksize < NFS_DIRFRAGSIZ) 553 ap->a_vap->va_blocksize = NFS_DIRFRAGSIZ; 554 } 555 nfsm_reqdone; 556 return (error); 557 } 558 559 /* 560 * nfs setattr call. 561 */ 562 int 563 nfs_setattr(void *v) 564 { 565 struct vop_setattr_args /* { 566 struct vnodeop_desc *a_desc; 567 struct vnode *a_vp; 568 struct vattr *a_vap; 569 kauth_cred_t a_cred; 570 } */ *ap = v; 571 struct vnode *vp = ap->a_vp; 572 struct nfsnode *np = VTONFS(vp); 573 struct vattr *vap = ap->a_vap; 574 int error = 0; 575 u_quad_t tsize = 0; 576 577 /* 578 * Setting of flags is not supported. 579 */ 580 if (vap->va_flags != VNOVAL) 581 return (EOPNOTSUPP); 582 583 /* 584 * Disallow write attempts if the filesystem is mounted read-only. 585 */ 586 if ((vap->va_uid != (uid_t)VNOVAL || 587 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 588 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 589 (vp->v_mount->mnt_flag & MNT_RDONLY)) 590 return (EROFS); 591 if (vap->va_size != VNOVAL) { 592 if (vap->va_size > VFSTONFS(vp->v_mount)->nm_maxfilesize) { 593 return EFBIG; 594 } 595 switch (vp->v_type) { 596 case VDIR: 597 return (EISDIR); 598 case VCHR: 599 case VBLK: 600 case VSOCK: 601 case VFIFO: 602 if (vap->va_mtime.tv_sec == VNOVAL && 603 vap->va_atime.tv_sec == VNOVAL && 604 vap->va_mode == (mode_t)VNOVAL && 605 vap->va_uid == (uid_t)VNOVAL && 606 vap->va_gid == (gid_t)VNOVAL) 607 return (0); 608 vap->va_size = VNOVAL; 609 break; 610 default: 611 /* 612 * Disallow write attempts if the filesystem is 613 * mounted read-only. 614 */ 615 if (vp->v_mount->mnt_flag & MNT_RDONLY) 616 return (EROFS); 617 genfs_node_wrlock(vp); 618 uvm_vnp_setsize(vp, vap->va_size); 619 tsize = np->n_size; 620 np->n_size = vap->va_size; 621 if (vap->va_size == 0) 622 error = nfs_vinvalbuf(vp, 0, 623 ap->a_cred, curlwp, 1); 624 else 625 error = nfs_vinvalbuf(vp, V_SAVE, 626 ap->a_cred, curlwp, 1); 627 if (error) { 628 uvm_vnp_setsize(vp, tsize); 629 genfs_node_unlock(vp); 630 return (error); 631 } 632 np->n_vattr->va_size = vap->va_size; 633 } 634 } else { 635 /* 636 * flush files before setattr because a later write of 637 * cached data might change timestamps or reset sugid bits 638 */ 639 if ((vap->va_mtime.tv_sec != VNOVAL || 640 vap->va_atime.tv_sec != VNOVAL || 641 vap->va_mode != VNOVAL) && 642 vp->v_type == VREG && 643 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, 644 curlwp, 1)) == EINTR) 645 return (error); 646 } 647 error = nfs_setattrrpc(vp, vap, ap->a_cred, curlwp); 648 if (vap->va_size != VNOVAL) { 649 if (error) { 650 np->n_size = np->n_vattr->va_size = tsize; 651 uvm_vnp_setsize(vp, np->n_size); 652 } 653 genfs_node_unlock(vp); 654 } 655 return (error); 656 } 657 658 /* 659 * Do an nfs setattr rpc. 660 */ 661 int 662 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, kauth_cred_t cred, struct lwp *l) 663 { 664 struct nfsv2_sattr *sp; 665 char *cp; 666 int32_t t1, t2; 667 char *bpos, *dpos; 668 u_int32_t *tl; 669 int error = 0; 670 struct mbuf *mreq, *mrep, *md, *mb; 671 const int v3 = NFS_ISV3(vp); 672 struct nfsnode *np = VTONFS(vp); 673 #ifndef NFS_V2_ONLY 674 int wccflag = NFSV3_WCCRATTR; 675 char *cp2; 676 #endif 677 678 nfsstats.rpccnt[NFSPROC_SETATTR]++; 679 nfsm_reqhead(np, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 680 nfsm_fhtom(np, v3); 681 #ifndef NFS_V2_ONLY 682 if (v3) { 683 nfsm_v3attrbuild(vap, true); 684 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 685 *tl = nfs_false; 686 } else { 687 #endif 688 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 689 if (vap->va_mode == (mode_t)VNOVAL) 690 sp->sa_mode = nfs_xdrneg1; 691 else 692 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 693 if (vap->va_uid == (uid_t)VNOVAL) 694 sp->sa_uid = nfs_xdrneg1; 695 else 696 sp->sa_uid = txdr_unsigned(vap->va_uid); 697 if (vap->va_gid == (gid_t)VNOVAL) 698 sp->sa_gid = nfs_xdrneg1; 699 else 700 sp->sa_gid = txdr_unsigned(vap->va_gid); 701 sp->sa_size = txdr_unsigned(vap->va_size); 702 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 703 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 704 #ifndef NFS_V2_ONLY 705 } 706 #endif 707 nfsm_request(np, NFSPROC_SETATTR, l, cred); 708 #ifndef NFS_V2_ONLY 709 if (v3) { 710 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false); 711 } else 712 #endif 713 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 714 nfsm_reqdone; 715 return (error); 716 } 717 718 /* 719 * nfs lookup call, one step at a time... 720 * First look in cache 721 * If not found, do the rpc. 722 */ 723 int 724 nfs_lookup(void *v) 725 { 726 struct vop_lookup_v2_args /* { 727 struct vnodeop_desc *a_desc; 728 struct vnode *a_dvp; 729 struct vnode **a_vpp; 730 struct componentname *a_cnp; 731 } */ *ap = v; 732 struct componentname *cnp = ap->a_cnp; 733 struct vnode *dvp = ap->a_dvp; 734 struct vnode **vpp = ap->a_vpp; 735 int flags; 736 struct vnode *newvp; 737 u_int32_t *tl; 738 char *cp; 739 int32_t t1, t2; 740 char *bpos, *dpos, *cp2; 741 struct mbuf *mreq, *mrep, *md, *mb; 742 long len; 743 nfsfh_t *fhp; 744 struct nfsnode *np; 745 int cachefound; 746 int error = 0, attrflag, fhsize; 747 const int v3 = NFS_ISV3(dvp); 748 749 flags = cnp->cn_flags; 750 751 *vpp = NULLVP; 752 newvp = NULLVP; 753 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 754 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 755 return (EROFS); 756 if (dvp->v_type != VDIR) 757 return (ENOTDIR); 758 759 /* 760 * RFC1813(nfsv3) 3.2 says clients should handle "." by themselves. 761 */ 762 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 763 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 764 if (error) 765 return error; 766 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) 767 return EISDIR; 768 vref(dvp); 769 *vpp = dvp; 770 return 0; 771 } 772 773 np = VTONFS(dvp); 774 775 /* 776 * Before performing an RPC, check the name cache to see if 777 * the directory/name pair we are looking for is known already. 778 * If the directory/name pair is found in the name cache, 779 * we have to ensure the directory has not changed from 780 * the time the cache entry has been created. If it has, 781 * the cache entry has to be ignored. 782 */ 783 cachefound = cache_lookup_raw(dvp, cnp->cn_nameptr, cnp->cn_namelen, 784 cnp->cn_flags, NULL, vpp); 785 KASSERT(dvp != *vpp); 786 KASSERT((cnp->cn_flags & ISWHITEOUT) == 0); 787 if (cachefound) { 788 struct vattr vattr; 789 790 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 791 if (error != 0) { 792 if (*vpp != NULLVP) 793 vrele(*vpp); 794 *vpp = NULLVP; 795 return error; 796 } 797 798 if (VOP_GETATTR(dvp, &vattr, cnp->cn_cred) 799 || timespeccmp(&vattr.va_mtime, 800 &VTONFS(dvp)->n_nctime, !=)) { 801 if (*vpp != NULLVP) { 802 vrele(*vpp); 803 *vpp = NULLVP; 804 } 805 cache_purge1(dvp, NULL, 0, PURGE_CHILDREN); 806 timespecclear(&np->n_nctime); 807 goto dorpc; 808 } 809 810 if (*vpp == NULLVP) { 811 /* namecache gave us a negative result */ 812 error = ENOENT; 813 goto noentry; 814 } 815 816 /* 817 * investigate the vnode returned by cache_lookup_raw. 818 * if it isn't appropriate, do an rpc. 819 */ 820 newvp = *vpp; 821 if ((flags & ISDOTDOT) != 0) { 822 VOP_UNLOCK(dvp); 823 } 824 error = vn_lock(newvp, LK_SHARED); 825 if ((flags & ISDOTDOT) != 0) { 826 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 827 } 828 if (error != 0) { 829 /* newvp has been reclaimed. */ 830 vrele(newvp); 831 *vpp = NULLVP; 832 goto dorpc; 833 } 834 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred) 835 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 836 nfsstats.lookupcache_hits++; 837 KASSERT(newvp->v_type != VNON); 838 VOP_UNLOCK(newvp); 839 return (0); 840 } 841 cache_purge1(newvp, NULL, 0, PURGE_PARENTS); 842 vput(newvp); 843 *vpp = NULLVP; 844 } 845 dorpc: 846 #if 0 847 /* 848 * because nfsv3 has the same CREATE semantics as ours, 849 * we don't have to perform LOOKUPs beforehand. 850 * 851 * XXX ideally we can do the same for nfsv2 in the case of !O_EXCL. 852 * XXX although we have no way to know if O_EXCL is requested or not. 853 */ 854 855 if (v3 && cnp->cn_nameiop == CREATE && 856 (flags & (ISLASTCN|ISDOTDOT)) == ISLASTCN && 857 (dvp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 858 return (EJUSTRETURN); 859 } 860 #endif /* 0 */ 861 862 error = 0; 863 newvp = NULLVP; 864 nfsstats.lookupcache_misses++; 865 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 866 len = cnp->cn_namelen; 867 nfsm_reqhead(np, NFSPROC_LOOKUP, 868 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 869 nfsm_fhtom(np, v3); 870 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 871 nfsm_request(np, NFSPROC_LOOKUP, curlwp, cnp->cn_cred); 872 if (error) { 873 nfsm_postop_attr(dvp, attrflag, 0); 874 m_freem(mrep); 875 goto nfsmout; 876 } 877 nfsm_getfh(fhp, fhsize, v3); 878 879 /* 880 * Handle RENAME case... 881 */ 882 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 883 if (NFS_CMPFH(np, fhp, fhsize)) { 884 m_freem(mrep); 885 return (EISDIR); 886 } 887 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 888 if (error) { 889 m_freem(mrep); 890 return error; 891 } 892 newvp = NFSTOV(np); 893 #ifndef NFS_V2_ONLY 894 if (v3) { 895 nfsm_postop_attr(newvp, attrflag, 0); 896 nfsm_postop_attr(dvp, attrflag, 0); 897 } else 898 #endif 899 nfsm_loadattr(newvp, (struct vattr *)0, 0); 900 *vpp = newvp; 901 m_freem(mrep); 902 goto validate; 903 } 904 905 /* 906 * The postop attr handling is duplicated for each if case, 907 * because it should be done while dvp is locked (unlocking 908 * dvp is different for each case). 909 */ 910 911 if (NFS_CMPFH(np, fhp, fhsize)) { 912 /* 913 * As we handle "." lookup locally, this is 914 * a broken server. 915 */ 916 m_freem(mrep); 917 return EBADRPC; 918 } else if (flags & ISDOTDOT) { 919 /* 920 * ".." lookup 921 */ 922 VOP_UNLOCK(dvp); 923 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 924 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 925 if (error) { 926 m_freem(mrep); 927 return error; 928 } 929 newvp = NFSTOV(np); 930 931 #ifndef NFS_V2_ONLY 932 if (v3) { 933 nfsm_postop_attr(newvp, attrflag, 0); 934 nfsm_postop_attr(dvp, attrflag, 0); 935 } else 936 #endif 937 nfsm_loadattr(newvp, (struct vattr *)0, 0); 938 } else { 939 /* 940 * Other lookups. 941 */ 942 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 943 if (error) { 944 m_freem(mrep); 945 return error; 946 } 947 newvp = NFSTOV(np); 948 #ifndef NFS_V2_ONLY 949 if (v3) { 950 nfsm_postop_attr(newvp, attrflag, 0); 951 nfsm_postop_attr(dvp, attrflag, 0); 952 } else 953 #endif 954 nfsm_loadattr(newvp, (struct vattr *)0, 0); 955 } 956 if (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) { 957 nfs_cache_enter(dvp, newvp, cnp); 958 } 959 *vpp = newvp; 960 nfsm_reqdone; 961 if (error) { 962 /* 963 * We get here only because of errors returned by 964 * the RPC. Otherwise we'll have returned above 965 * (the nfsm_* macros will jump to nfsm_reqdone 966 * on error). 967 */ 968 if (error == ENOENT && cnp->cn_nameiop != CREATE) { 969 nfs_cache_enter(dvp, NULL, cnp); 970 } 971 if (newvp != NULLVP) { 972 if (newvp == dvp) { 973 vrele(newvp); 974 } else { 975 vput(newvp); 976 } 977 } 978 noentry: 979 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 980 (flags & ISLASTCN) && error == ENOENT) { 981 if (dvp->v_mount->mnt_flag & MNT_RDONLY) { 982 error = EROFS; 983 } else { 984 error = EJUSTRETURN; 985 } 986 } 987 *vpp = NULL; 988 return error; 989 } 990 991 validate: 992 /* 993 * make sure we have valid type and size. 994 */ 995 996 newvp = *vpp; 997 if (newvp->v_type == VNON) { 998 struct vattr vattr; /* dummy */ 999 1000 KASSERT(VTONFS(newvp)->n_attrstamp == 0); 1001 error = VOP_GETATTR(newvp, &vattr, cnp->cn_cred); 1002 if (error) { 1003 vput(newvp); 1004 *vpp = NULL; 1005 } 1006 } 1007 if (error) 1008 return error; 1009 if (newvp != dvp) 1010 VOP_UNLOCK(newvp); 1011 return 0; 1012 } 1013 1014 /* 1015 * nfs read call. 1016 * Just call nfs_bioread() to do the work. 1017 */ 1018 int 1019 nfs_read(void *v) 1020 { 1021 struct vop_read_args /* { 1022 struct vnode *a_vp; 1023 struct uio *a_uio; 1024 int a_ioflag; 1025 kauth_cred_t a_cred; 1026 } */ *ap = v; 1027 struct vnode *vp = ap->a_vp; 1028 1029 if (vp->v_type != VREG) 1030 return EISDIR; 1031 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred, 0)); 1032 } 1033 1034 /* 1035 * nfs readlink call 1036 */ 1037 int 1038 nfs_readlink(void *v) 1039 { 1040 struct vop_readlink_args /* { 1041 struct vnode *a_vp; 1042 struct uio *a_uio; 1043 kauth_cred_t a_cred; 1044 } */ *ap = v; 1045 struct vnode *vp = ap->a_vp; 1046 struct nfsnode *np = VTONFS(vp); 1047 1048 if (vp->v_type != VLNK) 1049 return (EPERM); 1050 1051 if (np->n_rcred != NULL) { 1052 kauth_cred_free(np->n_rcred); 1053 } 1054 np->n_rcred = ap->a_cred; 1055 kauth_cred_hold(np->n_rcred); 1056 1057 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred, 0)); 1058 } 1059 1060 /* 1061 * Do a readlink rpc. 1062 * Called by nfs_doio() from below the buffer cache. 1063 */ 1064 int 1065 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 1066 { 1067 u_int32_t *tl; 1068 char *cp; 1069 int32_t t1, t2; 1070 char *bpos, *dpos, *cp2; 1071 int error = 0; 1072 uint32_t len; 1073 struct mbuf *mreq, *mrep, *md, *mb; 1074 const int v3 = NFS_ISV3(vp); 1075 struct nfsnode *np = VTONFS(vp); 1076 #ifndef NFS_V2_ONLY 1077 int attrflag; 1078 #endif 1079 1080 nfsstats.rpccnt[NFSPROC_READLINK]++; 1081 nfsm_reqhead(np, NFSPROC_READLINK, NFSX_FH(v3)); 1082 nfsm_fhtom(np, v3); 1083 nfsm_request(np, NFSPROC_READLINK, curlwp, cred); 1084 #ifndef NFS_V2_ONLY 1085 if (v3) 1086 nfsm_postop_attr(vp, attrflag, 0); 1087 #endif 1088 if (!error) { 1089 #ifndef NFS_V2_ONLY 1090 if (v3) { 1091 nfsm_dissect(tl, uint32_t *, NFSX_UNSIGNED); 1092 len = fxdr_unsigned(uint32_t, *tl); 1093 if (len > NFS_MAXPATHLEN) { 1094 /* 1095 * this pathname is too long for us. 1096 */ 1097 m_freem(mrep); 1098 /* Solaris returns EINVAL. should we follow? */ 1099 error = ENAMETOOLONG; 1100 goto nfsmout; 1101 } 1102 } else 1103 #endif 1104 { 1105 nfsm_strsiz(len, NFS_MAXPATHLEN); 1106 } 1107 nfsm_mtouio(uiop, len); 1108 } 1109 nfsm_reqdone; 1110 return (error); 1111 } 1112 1113 /* 1114 * nfs read rpc call 1115 * Ditto above 1116 */ 1117 int 1118 nfs_readrpc(struct vnode *vp, struct uio *uiop) 1119 { 1120 u_int32_t *tl; 1121 char *cp; 1122 int32_t t1, t2; 1123 char *bpos, *dpos, *cp2; 1124 struct mbuf *mreq, *mrep, *md, *mb; 1125 struct nfsmount *nmp; 1126 int error = 0, len, retlen, tsiz, eof __unused, byte_count; 1127 const int v3 = NFS_ISV3(vp); 1128 struct nfsnode *np = VTONFS(vp); 1129 #ifndef NFS_V2_ONLY 1130 int attrflag; 1131 #endif 1132 1133 #ifndef nolint 1134 eof = 0; 1135 #endif 1136 nmp = VFSTONFS(vp->v_mount); 1137 tsiz = uiop->uio_resid; 1138 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1139 return (EFBIG); 1140 iostat_busy(nmp->nm_stats); 1141 byte_count = 0; /* count bytes actually transferred */ 1142 while (tsiz > 0) { 1143 nfsstats.rpccnt[NFSPROC_READ]++; 1144 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1145 nfsm_reqhead(np, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1146 nfsm_fhtom(np, v3); 1147 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); 1148 #ifndef NFS_V2_ONLY 1149 if (v3) { 1150 txdr_hyper(uiop->uio_offset, tl); 1151 *(tl + 2) = txdr_unsigned(len); 1152 } else 1153 #endif 1154 { 1155 *tl++ = txdr_unsigned(uiop->uio_offset); 1156 *tl++ = txdr_unsigned(len); 1157 *tl = 0; 1158 } 1159 nfsm_request(np, NFSPROC_READ, curlwp, np->n_rcred); 1160 #ifndef NFS_V2_ONLY 1161 if (v3) { 1162 nfsm_postop_attr(vp, attrflag, NAC_NOTRUNC); 1163 if (error) { 1164 m_freem(mrep); 1165 goto nfsmout; 1166 } 1167 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1168 eof = fxdr_unsigned(int, *(tl + 1)); 1169 } else 1170 #endif 1171 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 1172 nfsm_strsiz(retlen, nmp->nm_rsize); 1173 nfsm_mtouio(uiop, retlen); 1174 m_freem(mrep); 1175 tsiz -= retlen; 1176 byte_count += retlen; 1177 #ifndef NFS_V2_ONLY 1178 if (v3) { 1179 if (eof || retlen == 0) 1180 tsiz = 0; 1181 } else 1182 #endif 1183 if (retlen < len) 1184 tsiz = 0; 1185 } 1186 nfsmout: 1187 iostat_unbusy(nmp->nm_stats, byte_count, 1); 1188 return (error); 1189 } 1190 1191 struct nfs_writerpc_context { 1192 kmutex_t nwc_lock; 1193 kcondvar_t nwc_cv; 1194 int nwc_mbufcount; 1195 }; 1196 1197 /* 1198 * free mbuf used to refer protected pages while write rpc call. 1199 * called at splvm. 1200 */ 1201 static void 1202 nfs_writerpc_extfree(struct mbuf *m, void *tbuf, size_t size, void *arg) 1203 { 1204 struct nfs_writerpc_context *ctx = arg; 1205 1206 KASSERT(m != NULL); 1207 KASSERT(ctx != NULL); 1208 pool_cache_put(mb_cache, m); 1209 mutex_enter(&ctx->nwc_lock); 1210 if (--ctx->nwc_mbufcount == 0) { 1211 cv_signal(&ctx->nwc_cv); 1212 } 1213 mutex_exit(&ctx->nwc_lock); 1214 } 1215 1216 /* 1217 * nfs write call 1218 */ 1219 int 1220 nfs_writerpc(struct vnode *vp, struct uio *uiop, int *iomode, bool pageprotected, bool *stalewriteverfp) 1221 { 1222 u_int32_t *tl; 1223 char *cp; 1224 int32_t t1, t2; 1225 char *bpos, *dpos; 1226 struct mbuf *mreq, *mrep, *md, *mb; 1227 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1228 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR; 1229 const int v3 = NFS_ISV3(vp); 1230 int committed = NFSV3WRITE_FILESYNC; 1231 struct nfsnode *np = VTONFS(vp); 1232 struct nfs_writerpc_context ctx; 1233 int byte_count; 1234 size_t origresid; 1235 #ifndef NFS_V2_ONLY 1236 char *cp2; 1237 int rlen, commit; 1238 #endif 1239 1240 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 1241 panic("writerpc readonly vp %p", vp); 1242 } 1243 1244 #ifdef DIAGNOSTIC 1245 if (uiop->uio_iovcnt != 1) 1246 panic("nfs: writerpc iovcnt > 1"); 1247 #endif 1248 tsiz = uiop->uio_resid; 1249 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1250 return EFBIG; 1251 1252 mutex_init(&ctx.nwc_lock, MUTEX_DRIVER, IPL_VM); 1253 cv_init(&ctx.nwc_cv, "nfsmblk"); 1254 ctx.nwc_mbufcount = 1; 1255 1256 retry: 1257 origresid = uiop->uio_resid; 1258 KASSERT(origresid == uiop->uio_iov->iov_len); 1259 iostat_busy(nmp->nm_stats); 1260 byte_count = 0; /* count of bytes actually written */ 1261 while (tsiz > 0) { 1262 uint32_t datalen; /* data bytes need to be allocated in mbuf */ 1263 size_t backup; 1264 bool stalewriteverf = false; 1265 1266 nfsstats.rpccnt[NFSPROC_WRITE]++; 1267 len = uimin(tsiz, nmp->nm_wsize); 1268 datalen = pageprotected ? 0 : nfsm_rndup(len); 1269 nfsm_reqhead(np, NFSPROC_WRITE, 1270 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + datalen); 1271 nfsm_fhtom(np, v3); 1272 #ifndef NFS_V2_ONLY 1273 if (v3) { 1274 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1275 txdr_hyper(uiop->uio_offset, tl); 1276 tl += 2; 1277 *tl++ = txdr_unsigned(len); 1278 *tl++ = txdr_unsigned(*iomode); 1279 *tl = txdr_unsigned(len); 1280 } else 1281 #endif 1282 { 1283 u_int32_t x; 1284 1285 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 1286 /* Set both "begin" and "current" to non-garbage. */ 1287 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1288 *tl++ = x; /* "begin offset" */ 1289 *tl++ = x; /* "current offset" */ 1290 x = txdr_unsigned(len); 1291 *tl++ = x; /* total to this offset */ 1292 *tl = x; /* size of this write */ 1293 1294 } 1295 if (pageprotected) { 1296 /* 1297 * since we know pages can't be modified during i/o, 1298 * no need to copy them for us. 1299 */ 1300 struct mbuf *m; 1301 struct iovec *iovp = uiop->uio_iov; 1302 1303 m = m_get(M_WAIT, MT_DATA); 1304 MCLAIM(m, &nfs_mowner); 1305 MEXTADD(m, iovp->iov_base, len, M_MBUF, 1306 nfs_writerpc_extfree, &ctx); 1307 m->m_flags |= M_EXT_ROMAP; 1308 m->m_len = len; 1309 mb->m_next = m; 1310 /* 1311 * no need to maintain mb and bpos here 1312 * because no one care them later. 1313 */ 1314 #if 0 1315 mb = m; 1316 bpos = mtod(void *, mb) + mb->m_len; 1317 #endif 1318 UIO_ADVANCE(uiop, len); 1319 uiop->uio_offset += len; 1320 mutex_enter(&ctx.nwc_lock); 1321 ctx.nwc_mbufcount++; 1322 mutex_exit(&ctx.nwc_lock); 1323 nfs_zeropad(mb, 0, nfsm_padlen(len)); 1324 } else { 1325 nfsm_uiotom(uiop, len); 1326 } 1327 nfsm_request(np, NFSPROC_WRITE, curlwp, np->n_wcred); 1328 #ifndef NFS_V2_ONLY 1329 if (v3) { 1330 wccflag = NFSV3_WCCCHK; 1331 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, !error); 1332 if (!error) { 1333 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED 1334 + NFSX_V3WRITEVERF); 1335 rlen = fxdr_unsigned(int, *tl++); 1336 if (rlen == 0) { 1337 error = NFSERR_IO; 1338 m_freem(mrep); 1339 break; 1340 } else if (rlen < len) { 1341 backup = len - rlen; 1342 UIO_ADVANCE(uiop, -backup); 1343 uiop->uio_offset -= backup; 1344 len = rlen; 1345 } 1346 commit = fxdr_unsigned(int, *tl++); 1347 1348 /* 1349 * Return the lowest committment level 1350 * obtained by any of the RPCs. 1351 */ 1352 if (committed == NFSV3WRITE_FILESYNC) 1353 committed = commit; 1354 else if (committed == NFSV3WRITE_DATASYNC && 1355 commit == NFSV3WRITE_UNSTABLE) 1356 committed = commit; 1357 mutex_enter(&nmp->nm_lock); 1358 if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0){ 1359 memcpy(nmp->nm_writeverf, tl, 1360 NFSX_V3WRITEVERF); 1361 nmp->nm_iflag |= NFSMNT_HASWRITEVERF; 1362 } else if ((nmp->nm_iflag & 1363 NFSMNT_STALEWRITEVERF) || 1364 memcmp(tl, nmp->nm_writeverf, 1365 NFSX_V3WRITEVERF)) { 1366 memcpy(nmp->nm_writeverf, tl, 1367 NFSX_V3WRITEVERF); 1368 /* 1369 * note NFSMNT_STALEWRITEVERF 1370 * if we're the first thread to 1371 * notice it. 1372 */ 1373 if ((nmp->nm_iflag & 1374 NFSMNT_STALEWRITEVERF) == 0) { 1375 stalewriteverf = true; 1376 nmp->nm_iflag |= 1377 NFSMNT_STALEWRITEVERF; 1378 } 1379 } 1380 mutex_exit(&nmp->nm_lock); 1381 } 1382 } else 1383 #endif 1384 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 1385 if (wccflag) 1386 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr->va_mtime; 1387 m_freem(mrep); 1388 if (error) 1389 break; 1390 tsiz -= len; 1391 byte_count += len; 1392 if (stalewriteverf) { 1393 *stalewriteverfp = true; 1394 stalewriteverf = false; 1395 if (committed == NFSV3WRITE_UNSTABLE && 1396 len != origresid) { 1397 /* 1398 * if our write requests weren't atomic but 1399 * unstable, datas in previous iterations 1400 * might have already been lost now. 1401 * then, we should resend them to nfsd. 1402 */ 1403 backup = origresid - tsiz; 1404 UIO_ADVANCE(uiop, -backup); 1405 uiop->uio_offset -= backup; 1406 tsiz = origresid; 1407 goto retry; 1408 } 1409 } 1410 } 1411 nfsmout: 1412 iostat_unbusy(nmp->nm_stats, byte_count, 0); 1413 if (pageprotected) { 1414 /* 1415 * wait until mbufs go away. 1416 * retransmitted mbufs can survive longer than rpc requests 1417 * themselves. 1418 */ 1419 mutex_enter(&ctx.nwc_lock); 1420 ctx.nwc_mbufcount--; 1421 while (ctx.nwc_mbufcount > 0) { 1422 cv_wait(&ctx.nwc_cv, &ctx.nwc_lock); 1423 } 1424 mutex_exit(&ctx.nwc_lock); 1425 } 1426 mutex_destroy(&ctx.nwc_lock); 1427 cv_destroy(&ctx.nwc_cv); 1428 *iomode = committed; 1429 if (error) 1430 uiop->uio_resid = tsiz; 1431 return (error); 1432 } 1433 1434 /* 1435 * nfs mknod rpc 1436 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1437 * mode set to specify the file type and the size field for rdev. 1438 */ 1439 int 1440 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, struct vattr *vap) 1441 { 1442 struct nfsv2_sattr *sp; 1443 u_int32_t *tl; 1444 char *cp; 1445 int32_t t1, t2; 1446 struct vnode *newvp = (struct vnode *)0; 1447 struct nfsnode *dnp, *np; 1448 char *cp2; 1449 char *bpos, *dpos; 1450 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1451 struct mbuf *mreq, *mrep, *md, *mb; 1452 u_int32_t rdev; 1453 const int v3 = NFS_ISV3(dvp); 1454 1455 if (vap->va_type == VCHR || vap->va_type == VBLK) 1456 rdev = txdr_unsigned(vap->va_rdev); 1457 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1458 rdev = nfs_xdrneg1; 1459 else { 1460 VOP_ABORTOP(dvp, cnp); 1461 return (EOPNOTSUPP); 1462 } 1463 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1464 dnp = VTONFS(dvp); 1465 nfsm_reqhead(dnp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1466 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1467 nfsm_fhtom(dnp, v3); 1468 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1469 #ifndef NFS_V2_ONLY 1470 if (v3) { 1471 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1472 *tl++ = vtonfsv3_type(vap->va_type); 1473 nfsm_v3attrbuild(vap, false); 1474 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1475 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1476 *tl++ = txdr_unsigned(major(vap->va_rdev)); 1477 *tl = txdr_unsigned(minor(vap->va_rdev)); 1478 } 1479 } else 1480 #endif 1481 { 1482 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1483 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1484 sp->sa_uid = nfs_xdrneg1; 1485 sp->sa_gid = nfs_xdrneg1; 1486 sp->sa_size = rdev; 1487 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1488 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1489 } 1490 nfsm_request(dnp, NFSPROC_MKNOD, curlwp, cnp->cn_cred); 1491 if (!error) { 1492 nfsm_mtofh(dvp, newvp, v3, gotvp); 1493 if (!gotvp) { 1494 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1495 cnp->cn_namelen, cnp->cn_cred, curlwp, &np); 1496 if (!error) 1497 newvp = NFSTOV(np); 1498 } 1499 } 1500 #ifndef NFS_V2_ONLY 1501 if (v3) 1502 nfsm_wcc_data(dvp, wccflag, 0, !error); 1503 #endif 1504 nfsm_reqdone; 1505 if (error) { 1506 if (newvp) 1507 vput(newvp); 1508 } else { 1509 nfs_cache_enter(dvp, newvp, cnp); 1510 *vpp = newvp; 1511 VOP_UNLOCK(newvp); 1512 } 1513 VTONFS(dvp)->n_flag |= NMODIFIED; 1514 if (!wccflag) 1515 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1516 return (error); 1517 } 1518 1519 /* 1520 * nfs mknod vop 1521 * just call nfs_mknodrpc() to do the work. 1522 */ 1523 /* ARGSUSED */ 1524 int 1525 nfs_mknod(void *v) 1526 { 1527 struct vop_mknod_v3_args /* { 1528 struct vnode *a_dvp; 1529 struct vnode **a_vpp; 1530 struct componentname *a_cnp; 1531 struct vattr *a_vap; 1532 } */ *ap = v; 1533 struct vnode *dvp = ap->a_dvp; 1534 struct componentname *cnp = ap->a_cnp; 1535 int error; 1536 1537 error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, ap->a_vap); 1538 if (error == 0 || error == EEXIST) 1539 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 1540 return (error); 1541 } 1542 1543 /* 1544 * nfs file create call 1545 */ 1546 int 1547 nfs_create(void *v) 1548 { 1549 struct vop_create_v3_args /* { 1550 struct vnode *a_dvp; 1551 struct vnode **a_vpp; 1552 struct componentname *a_cnp; 1553 struct vattr *a_vap; 1554 } */ *ap = v; 1555 struct vnode *dvp = ap->a_dvp; 1556 struct vattr *vap = ap->a_vap; 1557 struct componentname *cnp = ap->a_cnp; 1558 struct nfsv2_sattr *sp; 1559 u_int32_t *tl; 1560 char *cp; 1561 int32_t t1, t2; 1562 struct nfsnode *dnp, *np = (struct nfsnode *)0; 1563 struct vnode *newvp = (struct vnode *)0; 1564 char *bpos, *dpos, *cp2; 1565 int error, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1566 struct mbuf *mreq, *mrep, *md, *mb; 1567 const int v3 = NFS_ISV3(dvp); 1568 u_int32_t excl_mode = NFSV3CREATE_UNCHECKED; 1569 1570 /* 1571 * Oops, not for me.. 1572 */ 1573 if (vap->va_type == VSOCK) 1574 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1575 1576 KASSERT(vap->va_type == VREG); 1577 1578 #ifdef VA_EXCLUSIVE 1579 if (vap->va_vaflags & VA_EXCLUSIVE) { 1580 excl_mode = NFSV3CREATE_EXCLUSIVE; 1581 } 1582 #endif 1583 again: 1584 error = 0; 1585 nfsstats.rpccnt[NFSPROC_CREATE]++; 1586 dnp = VTONFS(dvp); 1587 nfsm_reqhead(dnp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1588 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1589 nfsm_fhtom(dnp, v3); 1590 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1591 #ifndef NFS_V2_ONLY 1592 if (v3) { 1593 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1594 if (excl_mode == NFSV3CREATE_EXCLUSIVE) { 1595 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1596 nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF); 1597 *tl++ = cprng_fast32(); 1598 *tl = cprng_fast32(); 1599 } else { 1600 *tl = txdr_unsigned(excl_mode); 1601 nfsm_v3attrbuild(vap, false); 1602 } 1603 } else 1604 #endif 1605 { 1606 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1607 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1608 sp->sa_uid = nfs_xdrneg1; 1609 sp->sa_gid = nfs_xdrneg1; 1610 sp->sa_size = 0; 1611 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1612 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1613 } 1614 nfsm_request(dnp, NFSPROC_CREATE, curlwp, cnp->cn_cred); 1615 if (!error) { 1616 nfsm_mtofh(dvp, newvp, v3, gotvp); 1617 if (!gotvp) { 1618 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1619 cnp->cn_namelen, cnp->cn_cred, curlwp, &np); 1620 if (!error) 1621 newvp = NFSTOV(np); 1622 } 1623 } 1624 #ifndef NFS_V2_ONLY 1625 if (v3) 1626 nfsm_wcc_data(dvp, wccflag, 0, !error); 1627 #endif 1628 nfsm_reqdone; 1629 if (error) { 1630 /* 1631 * nfs_request maps NFSERR_NOTSUPP to ENOTSUP. 1632 */ 1633 if (v3 && error == ENOTSUP) { 1634 if (excl_mode == NFSV3CREATE_EXCLUSIVE) { 1635 excl_mode = NFSV3CREATE_GUARDED; 1636 goto again; 1637 } else if (excl_mode == NFSV3CREATE_GUARDED) { 1638 excl_mode = NFSV3CREATE_UNCHECKED; 1639 goto again; 1640 } 1641 } 1642 } else if (v3 && (excl_mode == NFSV3CREATE_EXCLUSIVE)) { 1643 struct timespec ts; 1644 1645 getnanotime(&ts); 1646 1647 /* 1648 * make sure that we'll update timestamps as 1649 * most server implementations use them to store 1650 * the create verifier. 1651 * 1652 * XXX it's better to use TOSERVER always. 1653 */ 1654 1655 if (vap->va_atime.tv_sec == VNOVAL) 1656 vap->va_atime = ts; 1657 if (vap->va_mtime.tv_sec == VNOVAL) 1658 vap->va_mtime = ts; 1659 1660 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, curlwp); 1661 } 1662 if (error == 0) { 1663 if (cnp->cn_flags & MAKEENTRY) 1664 nfs_cache_enter(dvp, newvp, cnp); 1665 else 1666 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 1667 *ap->a_vpp = newvp; 1668 VOP_UNLOCK(newvp); 1669 } else { 1670 if (newvp) 1671 vput(newvp); 1672 if (error == EEXIST) 1673 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 1674 } 1675 VTONFS(dvp)->n_flag |= NMODIFIED; 1676 if (!wccflag) 1677 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1678 return (error); 1679 } 1680 1681 /* 1682 * nfs file remove call 1683 * To try and make nfs semantics closer to ufs semantics, a file that has 1684 * other processes using the vnode is renamed instead of removed and then 1685 * removed later on the last close. 1686 * - If vrefcnt(vp) > 1 1687 * If a rename is not already in the works 1688 * call nfs_sillyrename() to set it up 1689 * else 1690 * do the remove rpc 1691 */ 1692 int 1693 nfs_remove(void *v) 1694 { 1695 struct vop_remove_v3_args /* { 1696 struct vnodeop_desc *a_desc; 1697 struct vnode * a_dvp; 1698 struct vnode * a_vp; 1699 struct componentname * a_cnp; 1700 nlink_t ctx_vp_new_nlink; 1701 } */ *ap = v; 1702 struct vnode *vp = ap->a_vp; 1703 struct vnode *dvp = ap->a_dvp; 1704 struct componentname *cnp = ap->a_cnp; 1705 struct nfsnode *np = VTONFS(vp); 1706 int error = 0; 1707 struct vattr vattr; 1708 1709 #ifndef DIAGNOSTIC 1710 if (vrefcnt(vp) < 1) 1711 panic("nfs_remove: bad vrefcnt(vp)"); 1712 #endif 1713 if (vp->v_type == VDIR) 1714 error = EPERM; 1715 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1716 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1717 vattr.va_nlink > 1)) { 1718 /* 1719 * Purge the name cache so that the chance of a lookup for 1720 * the name succeeding while the remove is in progress is 1721 * minimized. Without node locking it can still happen, such 1722 * that an I/O op returns ESTALE, but since you get this if 1723 * another host removes the file.. 1724 */ 1725 cache_purge(vp); 1726 /* 1727 * throw away biocache buffers, mainly to avoid 1728 * unnecessary delayed writes later. 1729 */ 1730 error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, curlwp, 1); 1731 /* Do the rpc */ 1732 if (error != EINTR) 1733 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1734 cnp->cn_namelen, cnp->cn_cred, curlwp); 1735 } else if (!np->n_sillyrename) 1736 error = nfs_sillyrename(dvp, vp, cnp, false); 1737 if (error == 0 && nfs_getattrcache(vp, &vattr) == 0) { 1738 ap->ctx_vp_new_nlink = vattr.va_nlink - 1; 1739 if (vattr.va_nlink == 1) 1740 np->n_flag |= NREMOVED; 1741 } 1742 NFS_INVALIDATE_ATTRCACHE(np); 1743 if (dvp == vp) 1744 vrele(vp); 1745 else 1746 vput(vp); 1747 return (error); 1748 } 1749 1750 /* 1751 * nfs file remove rpc called from nfs_inactive 1752 */ 1753 int 1754 nfs_removeit(struct sillyrename *sp) 1755 { 1756 1757 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1758 (struct lwp *)0)); 1759 } 1760 1761 /* 1762 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1763 */ 1764 int 1765 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, kauth_cred_t cred, struct lwp *l) 1766 { 1767 u_int32_t *tl; 1768 char *cp; 1769 #ifndef NFS_V2_ONLY 1770 int32_t t1; 1771 char *cp2; 1772 #endif 1773 int32_t t2; 1774 char *bpos, *dpos; 1775 int error = 0, wccflag = NFSV3_WCCRATTR; 1776 struct mbuf *mreq, *mrep, *md, *mb; 1777 const int v3 = NFS_ISV3(dvp); 1778 int rexmit = 0; 1779 struct nfsnode *dnp = VTONFS(dvp); 1780 1781 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1782 nfsm_reqhead(dnp, NFSPROC_REMOVE, 1783 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1784 nfsm_fhtom(dnp, v3); 1785 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1786 nfsm_request1(dnp, NFSPROC_REMOVE, l, cred, &rexmit); 1787 #ifndef NFS_V2_ONLY 1788 if (v3) 1789 nfsm_wcc_data(dvp, wccflag, 0, !error); 1790 #endif 1791 nfsm_reqdone; 1792 VTONFS(dvp)->n_flag |= NMODIFIED; 1793 if (!wccflag) 1794 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1795 /* 1796 * Kludge City: If the first reply to the remove rpc is lost.. 1797 * the reply to the retransmitted request will be ENOENT 1798 * since the file was in fact removed 1799 * Therefore, we cheat and return success. 1800 */ 1801 if (rexmit && error == ENOENT) 1802 error = 0; 1803 return (error); 1804 } 1805 1806 /* 1807 * nfs file rename call 1808 */ 1809 int 1810 nfs_rename(void *v) 1811 { 1812 struct vop_rename_args /* { 1813 struct vnode *a_fdvp; 1814 struct vnode *a_fvp; 1815 struct componentname *a_fcnp; 1816 struct vnode *a_tdvp; 1817 struct vnode *a_tvp; 1818 struct componentname *a_tcnp; 1819 } */ *ap = v; 1820 struct vnode *fvp = ap->a_fvp; 1821 struct vnode *tvp = ap->a_tvp; 1822 struct vnode *fdvp = ap->a_fdvp; 1823 struct vnode *tdvp = ap->a_tdvp; 1824 struct componentname *tcnp = ap->a_tcnp; 1825 struct componentname *fcnp = ap->a_fcnp; 1826 int error; 1827 1828 /* Check for cross-device rename */ 1829 if ((fvp->v_mount != tdvp->v_mount) || 1830 (tvp && (fvp->v_mount != tvp->v_mount))) { 1831 error = EXDEV; 1832 goto out; 1833 } 1834 1835 /* 1836 * If the tvp exists and is in use, sillyrename it before doing the 1837 * rename of the new file over it. 1838 * 1839 * Have sillyrename use link instead of rename if possible, 1840 * so that we don't lose the file if the rename fails, and so 1841 * that there's no window when the "to" file doesn't exist. 1842 */ 1843 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1844 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp, true)) { 1845 VN_KNOTE(tvp, NOTE_DELETE); 1846 vput(tvp); 1847 tvp = NULL; 1848 } 1849 1850 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1851 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1852 curlwp); 1853 1854 VN_KNOTE(fdvp, NOTE_WRITE); 1855 VN_KNOTE(tdvp, NOTE_WRITE); 1856 if (error == 0 || error == EEXIST) { 1857 if (fvp->v_type == VDIR) 1858 cache_purge(fvp); 1859 else 1860 cache_purge1(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1861 0); 1862 if (tvp != NULL && tvp->v_type == VDIR) 1863 cache_purge(tvp); 1864 else 1865 cache_purge1(tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, 1866 0); 1867 } 1868 out: 1869 if (tdvp == tvp) 1870 vrele(tdvp); 1871 else 1872 vput(tdvp); 1873 if (tvp) 1874 vput(tvp); 1875 vrele(fdvp); 1876 vrele(fvp); 1877 return (error); 1878 } 1879 1880 /* 1881 * nfs file rename rpc called from nfs_remove() above 1882 */ 1883 int 1884 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, struct sillyrename *sp) 1885 { 1886 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 1887 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, curlwp)); 1888 } 1889 1890 /* 1891 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1892 */ 1893 int 1894 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, struct vnode *tdvp, const char *tnameptr, int tnamelen, kauth_cred_t cred, struct lwp *l) 1895 { 1896 u_int32_t *tl; 1897 char *cp; 1898 #ifndef NFS_V2_ONLY 1899 int32_t t1; 1900 char *cp2; 1901 #endif 1902 int32_t t2; 1903 char *bpos, *dpos; 1904 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1905 struct mbuf *mreq, *mrep, *md, *mb; 1906 const int v3 = NFS_ISV3(fdvp); 1907 int rexmit = 0; 1908 struct nfsnode *fdnp = VTONFS(fdvp); 1909 1910 nfsstats.rpccnt[NFSPROC_RENAME]++; 1911 nfsm_reqhead(fdnp, NFSPROC_RENAME, 1912 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1913 nfsm_rndup(tnamelen)); 1914 nfsm_fhtom(fdnp, v3); 1915 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1916 nfsm_fhtom(VTONFS(tdvp), v3); 1917 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1918 nfsm_request1(fdnp, NFSPROC_RENAME, l, cred, &rexmit); 1919 #ifndef NFS_V2_ONLY 1920 if (v3) { 1921 nfsm_wcc_data(fdvp, fwccflag, 0, !error); 1922 nfsm_wcc_data(tdvp, twccflag, 0, !error); 1923 } 1924 #endif 1925 nfsm_reqdone; 1926 VTONFS(fdvp)->n_flag |= NMODIFIED; 1927 VTONFS(tdvp)->n_flag |= NMODIFIED; 1928 if (!fwccflag) 1929 NFS_INVALIDATE_ATTRCACHE(VTONFS(fdvp)); 1930 if (!twccflag) 1931 NFS_INVALIDATE_ATTRCACHE(VTONFS(tdvp)); 1932 /* 1933 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1934 */ 1935 if (rexmit && error == ENOENT) 1936 error = 0; 1937 return (error); 1938 } 1939 1940 /* 1941 * NFS link RPC, called from nfs_link. 1942 * Assumes dvp and vp locked, and leaves them that way. 1943 */ 1944 1945 static int 1946 nfs_linkrpc(struct vnode *dvp, struct vnode *vp, const char *name, 1947 size_t namelen, kauth_cred_t cred, struct lwp *l) 1948 { 1949 u_int32_t *tl; 1950 char *cp; 1951 #ifndef NFS_V2_ONLY 1952 int32_t t1; 1953 char *cp2; 1954 #endif 1955 int32_t t2; 1956 char *bpos, *dpos; 1957 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1958 struct mbuf *mreq, *mrep, *md, *mb; 1959 const int v3 = NFS_ISV3(dvp); 1960 int rexmit = 0; 1961 struct nfsnode *np = VTONFS(vp); 1962 1963 nfsstats.rpccnt[NFSPROC_LINK]++; 1964 nfsm_reqhead(np, NFSPROC_LINK, 1965 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1966 nfsm_fhtom(np, v3); 1967 nfsm_fhtom(VTONFS(dvp), v3); 1968 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1969 nfsm_request1(np, NFSPROC_LINK, l, cred, &rexmit); 1970 #ifndef NFS_V2_ONLY 1971 if (v3) { 1972 nfsm_postop_attr(vp, attrflag, 0); 1973 nfsm_wcc_data(dvp, wccflag, 0, !error); 1974 } 1975 #endif 1976 nfsm_reqdone; 1977 1978 VTONFS(dvp)->n_flag |= NMODIFIED; 1979 if (!attrflag) 1980 NFS_INVALIDATE_ATTRCACHE(VTONFS(vp)); 1981 if (!wccflag) 1982 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1983 1984 /* 1985 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 1986 */ 1987 if (rexmit && error == EEXIST) 1988 error = 0; 1989 1990 return error; 1991 } 1992 1993 /* 1994 * nfs hard link create call 1995 */ 1996 int 1997 nfs_link(void *v) 1998 { 1999 struct vop_link_v2_args /* { 2000 struct vnode *a_dvp; 2001 struct vnode *a_vp; 2002 struct componentname *a_cnp; 2003 } */ *ap = v; 2004 struct vnode *vp = ap->a_vp; 2005 struct vnode *dvp = ap->a_dvp; 2006 struct componentname *cnp = ap->a_cnp; 2007 int error = 0; 2008 2009 error = vn_lock(vp, LK_EXCLUSIVE); 2010 if (error != 0) { 2011 VOP_ABORTOP(dvp, cnp); 2012 return error; 2013 } 2014 2015 /* 2016 * Push all writes to the server, so that the attribute cache 2017 * doesn't get "out of sync" with the server. 2018 * XXX There should be a better way! 2019 */ 2020 VOP_FSYNC(vp, cnp->cn_cred, FSYNC_WAIT, 0, 0); 2021 2022 error = nfs_linkrpc(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 2023 cnp->cn_cred, curlwp); 2024 2025 if (error == 0) { 2026 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 2027 } 2028 VOP_UNLOCK(vp); 2029 return (error); 2030 } 2031 2032 /* 2033 * nfs symbolic link create call 2034 */ 2035 int 2036 nfs_symlink(void *v) 2037 { 2038 struct vop_symlink_v3_args /* { 2039 struct vnode *a_dvp; 2040 struct vnode **a_vpp; 2041 struct componentname *a_cnp; 2042 struct vattr *a_vap; 2043 char *a_target; 2044 } */ *ap = v; 2045 struct vnode *dvp = ap->a_dvp; 2046 struct vattr *vap = ap->a_vap; 2047 struct componentname *cnp = ap->a_cnp; 2048 struct nfsv2_sattr *sp; 2049 u_int32_t *tl; 2050 char *cp; 2051 int32_t t1, t2; 2052 char *bpos, *dpos, *cp2; 2053 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 2054 struct mbuf *mreq, *mrep, *md, *mb; 2055 struct vnode *newvp = (struct vnode *)0; 2056 const int v3 = NFS_ISV3(dvp); 2057 int rexmit = 0; 2058 struct nfsnode *dnp = VTONFS(dvp); 2059 2060 *ap->a_vpp = NULL; 2061 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 2062 slen = strlen(ap->a_target); 2063 nfsm_reqhead(dnp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 2064 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 2065 nfsm_fhtom(dnp, v3); 2066 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2067 #ifndef NFS_V2_ONlY 2068 if (v3) 2069 nfsm_v3attrbuild(vap, false); 2070 #endif 2071 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 2072 #ifndef NFS_V2_ONlY 2073 if (!v3) { 2074 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2075 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 2076 sp->sa_uid = nfs_xdrneg1; 2077 sp->sa_gid = nfs_xdrneg1; 2078 sp->sa_size = nfs_xdrneg1; 2079 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2080 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2081 } 2082 #endif 2083 nfsm_request1(dnp, NFSPROC_SYMLINK, curlwp, cnp->cn_cred, 2084 &rexmit); 2085 #ifndef NFS_V2_ONlY 2086 if (v3) { 2087 if (!error) 2088 nfsm_mtofh(dvp, newvp, v3, gotvp); 2089 nfsm_wcc_data(dvp, wccflag, 0, !error); 2090 } 2091 #endif 2092 nfsm_reqdone; 2093 /* 2094 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 2095 */ 2096 if (rexmit && error == EEXIST) 2097 error = 0; 2098 if (error == 0 || error == EEXIST) 2099 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 2100 if (error == 0 && newvp == NULL) { 2101 struct nfsnode *np = NULL; 2102 2103 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2104 cnp->cn_cred, curlwp, &np); 2105 if (error == 0) 2106 newvp = NFSTOV(np); 2107 } 2108 if (error) { 2109 if (newvp != NULL) 2110 vput(newvp); 2111 } else { 2112 *ap->a_vpp = newvp; 2113 VOP_UNLOCK(newvp); 2114 } 2115 VTONFS(dvp)->n_flag |= NMODIFIED; 2116 if (!wccflag) 2117 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2118 return (error); 2119 } 2120 2121 /* 2122 * nfs make dir call 2123 */ 2124 int 2125 nfs_mkdir(void *v) 2126 { 2127 struct vop_mkdir_v3_args /* { 2128 struct vnode *a_dvp; 2129 struct vnode **a_vpp; 2130 struct componentname *a_cnp; 2131 struct vattr *a_vap; 2132 } */ *ap = v; 2133 struct vnode *dvp = ap->a_dvp; 2134 struct vattr *vap = ap->a_vap; 2135 struct componentname *cnp = ap->a_cnp; 2136 struct nfsv2_sattr *sp; 2137 u_int32_t *tl; 2138 char *cp; 2139 int32_t t1, t2; 2140 int len; 2141 struct nfsnode *dnp = VTONFS(dvp), *np = (struct nfsnode *)0; 2142 struct vnode *newvp = (struct vnode *)0; 2143 char *bpos, *dpos, *cp2; 2144 int error = 0, wccflag = NFSV3_WCCRATTR; 2145 int gotvp = 0; 2146 int rexmit = 0; 2147 struct mbuf *mreq, *mrep, *md, *mb; 2148 const int v3 = NFS_ISV3(dvp); 2149 2150 len = cnp->cn_namelen; 2151 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2152 nfsm_reqhead(dnp, NFSPROC_MKDIR, 2153 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 2154 nfsm_fhtom(dnp, v3); 2155 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 2156 #ifndef NFS_V2_ONLY 2157 if (v3) { 2158 nfsm_v3attrbuild(vap, false); 2159 } else 2160 #endif 2161 { 2162 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2163 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2164 sp->sa_uid = nfs_xdrneg1; 2165 sp->sa_gid = nfs_xdrneg1; 2166 sp->sa_size = nfs_xdrneg1; 2167 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2168 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2169 } 2170 nfsm_request1(dnp, NFSPROC_MKDIR, curlwp, cnp->cn_cred, &rexmit); 2171 if (!error) 2172 nfsm_mtofh(dvp, newvp, v3, gotvp); 2173 if (v3) 2174 nfsm_wcc_data(dvp, wccflag, 0, !error); 2175 nfsm_reqdone; 2176 VTONFS(dvp)->n_flag |= NMODIFIED; 2177 if (!wccflag) 2178 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2179 /* 2180 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 2181 * if we can succeed in looking up the directory. 2182 */ 2183 if ((rexmit && error == EEXIST) || (!error && !gotvp)) { 2184 if (newvp) { 2185 vput(newvp); 2186 newvp = (struct vnode *)0; 2187 } 2188 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2189 curlwp, &np); 2190 if (!error) { 2191 newvp = NFSTOV(np); 2192 if (newvp->v_type != VDIR || newvp == dvp) 2193 error = EEXIST; 2194 } 2195 } 2196 if (error) { 2197 if (newvp) { 2198 if (dvp != newvp) 2199 vput(newvp); 2200 else 2201 vrele(newvp); 2202 } 2203 } else { 2204 nfs_cache_enter(dvp, newvp, cnp); 2205 *ap->a_vpp = newvp; 2206 VOP_UNLOCK(newvp); 2207 } 2208 return (error); 2209 } 2210 2211 /* 2212 * nfs remove directory call 2213 */ 2214 int 2215 nfs_rmdir(void *v) 2216 { 2217 struct vop_rmdir_v2_args /* { 2218 struct vnode *a_dvp; 2219 struct vnode *a_vp; 2220 struct componentname *a_cnp; 2221 } */ *ap = v; 2222 struct vnode *vp = ap->a_vp; 2223 struct vnode *dvp = ap->a_dvp; 2224 struct componentname *cnp = ap->a_cnp; 2225 u_int32_t *tl; 2226 char *cp; 2227 #ifndef NFS_V2_ONLY 2228 int32_t t1; 2229 char *cp2; 2230 #endif 2231 int32_t t2; 2232 char *bpos, *dpos; 2233 int error = 0, wccflag = NFSV3_WCCRATTR; 2234 int rexmit = 0; 2235 struct mbuf *mreq, *mrep, *md, *mb; 2236 const int v3 = NFS_ISV3(dvp); 2237 struct nfsnode *dnp; 2238 2239 if (dvp == vp) { 2240 vrele(vp); 2241 return (EINVAL); 2242 } 2243 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2244 dnp = VTONFS(dvp); 2245 nfsm_reqhead(dnp, NFSPROC_RMDIR, 2246 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2247 nfsm_fhtom(dnp, v3); 2248 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2249 nfsm_request1(dnp, NFSPROC_RMDIR, curlwp, cnp->cn_cred, &rexmit); 2250 #ifndef NFS_V2_ONLY 2251 if (v3) 2252 nfsm_wcc_data(dvp, wccflag, 0, !error); 2253 #endif 2254 nfsm_reqdone; 2255 VTONFS(dvp)->n_flag |= NMODIFIED; 2256 if (!wccflag) 2257 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2258 cache_purge(vp); 2259 vput(vp); 2260 /* 2261 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2262 */ 2263 if (rexmit && error == ENOENT) 2264 error = 0; 2265 return (error); 2266 } 2267 2268 /* 2269 * nfs readdir call 2270 */ 2271 int 2272 nfs_readdir(void *v) 2273 { 2274 struct vop_readdir_args /* { 2275 struct vnode *a_vp; 2276 struct uio *a_uio; 2277 kauth_cred_t a_cred; 2278 int *a_eofflag; 2279 off_t **a_cookies; 2280 int *a_ncookies; 2281 } */ *ap = v; 2282 struct vnode *vp = ap->a_vp; 2283 struct uio *uio = ap->a_uio; 2284 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2285 char *base = uio->uio_iov->iov_base; 2286 int tresid, error; 2287 size_t count, lost; 2288 struct dirent *dp; 2289 off_t *cookies = NULL; 2290 int ncookies = 0, nc; 2291 2292 if (vp->v_type != VDIR) 2293 return (EPERM); 2294 2295 lost = uio->uio_resid & (NFS_DIRFRAGSIZ - 1); 2296 count = uio->uio_resid - lost; 2297 if (count <= 0) 2298 return (EINVAL); 2299 2300 /* 2301 * Call nfs_bioread() to do the real work. 2302 */ 2303 tresid = uio->uio_resid = count; 2304 error = nfs_bioread(vp, uio, 0, ap->a_cred, 2305 ap->a_cookies ? NFSBIO_CACHECOOKIES : 0); 2306 2307 if (!error && ap->a_cookies) { 2308 ncookies = count / 16; 2309 cookies = malloc(sizeof (off_t) * ncookies, M_TEMP, M_WAITOK); 2310 *ap->a_cookies = cookies; 2311 } 2312 2313 if (!error && uio->uio_resid == tresid) { 2314 uio->uio_resid += lost; 2315 nfsstats.direofcache_misses++; 2316 if (ap->a_cookies) 2317 *ap->a_ncookies = 0; 2318 *ap->a_eofflag = 1; 2319 return (0); 2320 } 2321 2322 if (!error && ap->a_cookies) { 2323 /* 2324 * Only the NFS server and emulations use cookies, and they 2325 * load the directory block into system space, so we can 2326 * just look at it directly. 2327 */ 2328 if (!VMSPACE_IS_KERNEL_P(uio->uio_vmspace) || 2329 uio->uio_iovcnt != 1) 2330 panic("nfs_readdir: lost in space"); 2331 for (nc = 0; ncookies-- && 2332 base < (char *)uio->uio_iov->iov_base; nc++){ 2333 dp = (struct dirent *) base; 2334 if (dp->d_reclen == 0) 2335 break; 2336 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) 2337 *(cookies++) = (off_t)NFS_GETCOOKIE32(dp); 2338 else 2339 *(cookies++) = NFS_GETCOOKIE(dp); 2340 base += dp->d_reclen; 2341 } 2342 uio->uio_resid += 2343 ((char *)uio->uio_iov->iov_base - base); 2344 uio->uio_iov->iov_len += 2345 ((char *)uio->uio_iov->iov_base - base); 2346 uio->uio_iov->iov_base = base; 2347 *ap->a_ncookies = nc; 2348 } 2349 2350 uio->uio_resid += lost; 2351 *ap->a_eofflag = 0; 2352 return (error); 2353 } 2354 2355 /* 2356 * Readdir rpc call. 2357 * Called from below the buffer cache by nfs_doio(). 2358 */ 2359 int 2360 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 2361 { 2362 int len, left; 2363 struct dirent *dp = NULL; 2364 u_int32_t *tl; 2365 char *cp; 2366 int32_t t1, t2; 2367 char *bpos, *dpos, *cp2; 2368 struct mbuf *mreq, *mrep, *md, *mb; 2369 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2370 struct nfsnode *dnp = VTONFS(vp); 2371 u_quad_t fileno; 2372 int error = 0, more_dirs = 1, blksiz = 0, bigenough = 1; 2373 #ifndef NFS_V2_ONLY 2374 int attrflag; 2375 #endif 2376 int nrpcs = 0, reclen; 2377 const int v3 = NFS_ISV3(vp); 2378 2379 #ifdef DIAGNOSTIC 2380 /* 2381 * Should be called from buffer cache, so only amount of 2382 * NFS_DIRBLKSIZ will be requested. 2383 */ 2384 if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ) 2385 panic("nfs readdirrpc bad uio"); 2386 #endif 2387 2388 /* 2389 * Loop around doing readdir rpc's of size nm_readdirsize 2390 * truncated to a multiple of NFS_DIRFRAGSIZ. 2391 * The stopping criteria is EOF or buffer full. 2392 */ 2393 while (more_dirs && bigenough) { 2394 /* 2395 * Heuristic: don't bother to do another RPC to further 2396 * fill up this block if there is not much room left. (< 50% 2397 * of the readdir RPC size). This wastes some buffer space 2398 * but can save up to 50% in RPC calls. 2399 */ 2400 if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) { 2401 bigenough = 0; 2402 break; 2403 } 2404 nfsstats.rpccnt[NFSPROC_READDIR]++; 2405 nfsm_reqhead(dnp, NFSPROC_READDIR, NFSX_FH(v3) + 2406 NFSX_READDIR(v3)); 2407 nfsm_fhtom(dnp, v3); 2408 #ifndef NFS_V2_ONLY 2409 if (v3) { 2410 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2411 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) { 2412 txdr_swapcookie3(uiop->uio_offset, tl); 2413 } else { 2414 txdr_cookie3(uiop->uio_offset, tl); 2415 } 2416 tl += 2; 2417 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2418 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2419 } else 2420 #endif 2421 { 2422 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2423 *tl++ = txdr_unsigned(uiop->uio_offset); 2424 } 2425 *tl = txdr_unsigned(nmp->nm_readdirsize); 2426 nfsm_request(dnp, NFSPROC_READDIR, curlwp, cred); 2427 nrpcs++; 2428 #ifndef NFS_V2_ONLY 2429 if (v3) { 2430 nfsm_postop_attr(vp, attrflag, 0); 2431 if (!error) { 2432 nfsm_dissect(tl, u_int32_t *, 2433 2 * NFSX_UNSIGNED); 2434 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2435 dnp->n_cookieverf.nfsuquad[1] = *tl; 2436 } else { 2437 m_freem(mrep); 2438 goto nfsmout; 2439 } 2440 } 2441 #endif 2442 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2443 more_dirs = fxdr_unsigned(int, *tl); 2444 2445 /* loop thru the dir entries, doctoring them to 4bsd form */ 2446 while (more_dirs && bigenough) { 2447 #ifndef NFS_V2_ONLY 2448 if (v3) { 2449 nfsm_dissect(tl, u_int32_t *, 2450 3 * NFSX_UNSIGNED); 2451 fileno = fxdr_hyper(tl); 2452 len = fxdr_unsigned(int, *(tl + 2)); 2453 } else 2454 #endif 2455 { 2456 nfsm_dissect(tl, u_int32_t *, 2457 2 * NFSX_UNSIGNED); 2458 fileno = fxdr_unsigned(u_quad_t, *tl++); 2459 len = fxdr_unsigned(int, *tl); 2460 } 2461 if (len <= 0 || len > NFS_MAXNAMLEN) { 2462 error = EBADRPC; 2463 m_freem(mrep); 2464 goto nfsmout; 2465 } 2466 /* for cookie stashing */ 2467 reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t); 2468 left = NFS_DIRFRAGSIZ - blksiz; 2469 if (reclen > left) { 2470 memset(uiop->uio_iov->iov_base, 0, left); 2471 dp->d_reclen += left; 2472 UIO_ADVANCE(uiop, left); 2473 blksiz = 0; 2474 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2475 } 2476 if (reclen > uiop->uio_resid) 2477 bigenough = 0; 2478 if (bigenough) { 2479 int tlen; 2480 2481 dp = (struct dirent *)uiop->uio_iov->iov_base; 2482 dp->d_fileno = fileno; 2483 dp->d_namlen = len; 2484 dp->d_reclen = reclen; 2485 dp->d_type = DT_UNKNOWN; 2486 blksiz += reclen; 2487 if (blksiz == NFS_DIRFRAGSIZ) 2488 blksiz = 0; 2489 UIO_ADVANCE(uiop, DIRHDSIZ); 2490 nfsm_mtouio(uiop, len); 2491 tlen = reclen - (DIRHDSIZ + len); 2492 (void)memset(uiop->uio_iov->iov_base, 0, tlen); 2493 UIO_ADVANCE(uiop, tlen); 2494 } else 2495 nfsm_adv(nfsm_rndup(len)); 2496 #ifndef NFS_V2_ONLY 2497 if (v3) { 2498 nfsm_dissect(tl, u_int32_t *, 2499 3 * NFSX_UNSIGNED); 2500 } else 2501 #endif 2502 { 2503 nfsm_dissect(tl, u_int32_t *, 2504 2 * NFSX_UNSIGNED); 2505 } 2506 if (bigenough) { 2507 #ifndef NFS_V2_ONLY 2508 if (v3) { 2509 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) 2510 uiop->uio_offset = 2511 fxdr_swapcookie3(tl); 2512 else 2513 uiop->uio_offset = 2514 fxdr_cookie3(tl); 2515 } 2516 else 2517 #endif 2518 { 2519 uiop->uio_offset = 2520 fxdr_unsigned(off_t, *tl); 2521 } 2522 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2523 } 2524 if (v3) 2525 tl += 2; 2526 else 2527 tl++; 2528 more_dirs = fxdr_unsigned(int, *tl); 2529 } 2530 /* 2531 * If at end of rpc data, get the eof boolean 2532 */ 2533 if (!more_dirs) { 2534 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2535 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2536 2537 /* 2538 * kludge: if we got no entries, treat it as EOF. 2539 * some server sometimes send a reply without any 2540 * entries or EOF. 2541 * although it might mean the server has very long name, 2542 * we can't handle such entries anyway. 2543 */ 2544 2545 if (uiop->uio_resid >= NFS_DIRBLKSIZ) 2546 more_dirs = 0; 2547 } 2548 m_freem(mrep); 2549 } 2550 /* 2551 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ 2552 * by increasing d_reclen for the last record. 2553 */ 2554 if (blksiz > 0) { 2555 left = NFS_DIRFRAGSIZ - blksiz; 2556 memset(uiop->uio_iov->iov_base, 0, left); 2557 dp->d_reclen += left; 2558 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2559 UIO_ADVANCE(uiop, left); 2560 } 2561 2562 /* 2563 * We are now either at the end of the directory or have filled the 2564 * block. 2565 */ 2566 if (bigenough) { 2567 dnp->n_direofoffset = uiop->uio_offset; 2568 dnp->n_flag |= NEOFVALID; 2569 } 2570 nfsmout: 2571 return (error); 2572 } 2573 2574 #ifndef NFS_V2_ONLY 2575 /* 2576 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2577 */ 2578 int 2579 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 2580 { 2581 int len, left; 2582 struct dirent *dp = NULL; 2583 u_int32_t *tl; 2584 char *cp; 2585 int32_t t1, t2; 2586 struct vnode *newvp; 2587 char *bpos, *dpos, *cp2; 2588 struct mbuf *mreq, *mrep, *md, *mb; 2589 struct nameidata nami, *ndp = &nami; 2590 struct componentname *cnp = &ndp->ni_cnd; 2591 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2592 struct nfsnode *dnp = VTONFS(vp), *np; 2593 nfsfh_t *fhp; 2594 u_quad_t fileno; 2595 int error = 0, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2596 int attrflag, fhsize, nrpcs = 0, reclen; 2597 struct nfs_fattr fattr, *fp; 2598 2599 #ifdef DIAGNOSTIC 2600 if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ) 2601 panic("nfs readdirplusrpc bad uio"); 2602 #endif 2603 ndp->ni_dvp = vp; 2604 newvp = NULLVP; 2605 2606 /* 2607 * Loop around doing readdir rpc's of size nm_readdirsize 2608 * truncated to a multiple of NFS_DIRFRAGSIZ. 2609 * The stopping criteria is EOF or buffer full. 2610 */ 2611 while (more_dirs && bigenough) { 2612 if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) { 2613 bigenough = 0; 2614 break; 2615 } 2616 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2617 nfsm_reqhead(dnp, NFSPROC_READDIRPLUS, 2618 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2619 nfsm_fhtom(dnp, 1); 2620 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2621 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) { 2622 txdr_swapcookie3(uiop->uio_offset, tl); 2623 } else { 2624 txdr_cookie3(uiop->uio_offset, tl); 2625 } 2626 tl += 2; 2627 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2628 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2629 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2630 *tl = txdr_unsigned(nmp->nm_rsize); 2631 nfsm_request(dnp, NFSPROC_READDIRPLUS, curlwp, cred); 2632 nfsm_postop_attr(vp, attrflag, 0); 2633 if (error) { 2634 m_freem(mrep); 2635 goto nfsmout; 2636 } 2637 nrpcs++; 2638 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2639 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2640 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2641 more_dirs = fxdr_unsigned(int, *tl); 2642 2643 /* loop thru the dir entries, doctoring them to 4bsd form */ 2644 while (more_dirs && bigenough) { 2645 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2646 fileno = fxdr_hyper(tl); 2647 len = fxdr_unsigned(int, *(tl + 2)); 2648 if (len <= 0 || len > NFS_MAXNAMLEN) { 2649 error = EBADRPC; 2650 m_freem(mrep); 2651 goto nfsmout; 2652 } 2653 /* for cookie stashing */ 2654 reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t); 2655 left = NFS_DIRFRAGSIZ - blksiz; 2656 if (reclen > left) { 2657 /* 2658 * DIRFRAGSIZ is aligned, no need to align 2659 * again here. 2660 */ 2661 memset(uiop->uio_iov->iov_base, 0, left); 2662 dp->d_reclen += left; 2663 UIO_ADVANCE(uiop, left); 2664 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2665 blksiz = 0; 2666 } 2667 if (reclen > uiop->uio_resid) 2668 bigenough = 0; 2669 if (bigenough) { 2670 int tlen; 2671 2672 dp = (struct dirent *)uiop->uio_iov->iov_base; 2673 dp->d_fileno = fileno; 2674 dp->d_namlen = len; 2675 dp->d_reclen = reclen; 2676 dp->d_type = DT_UNKNOWN; 2677 blksiz += reclen; 2678 if (blksiz == NFS_DIRFRAGSIZ) 2679 blksiz = 0; 2680 UIO_ADVANCE(uiop, DIRHDSIZ); 2681 nfsm_mtouio(uiop, len); 2682 tlen = reclen - (DIRHDSIZ + len); 2683 (void)memset(uiop->uio_iov->iov_base, 0, tlen); 2684 UIO_ADVANCE(uiop, tlen); 2685 cnp->cn_nameptr = dp->d_name; 2686 cnp->cn_namelen = dp->d_namlen; 2687 } else 2688 nfsm_adv(nfsm_rndup(len)); 2689 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2690 if (bigenough) { 2691 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) 2692 uiop->uio_offset = 2693 fxdr_swapcookie3(tl); 2694 else 2695 uiop->uio_offset = 2696 fxdr_cookie3(tl); 2697 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2698 } 2699 tl += 2; 2700 2701 /* 2702 * Since the attributes are before the file handle 2703 * (sigh), we must skip over the attributes and then 2704 * come back and get them. 2705 */ 2706 attrflag = fxdr_unsigned(int, *tl); 2707 if (attrflag) { 2708 nfsm_dissect(fp, struct nfs_fattr *, NFSX_V3FATTR); 2709 memcpy(&fattr, fp, NFSX_V3FATTR); 2710 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2711 doit = fxdr_unsigned(int, *tl); 2712 if (doit) { 2713 nfsm_getfh(fhp, fhsize, 1); 2714 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2715 vref(vp); 2716 newvp = vp; 2717 np = dnp; 2718 } else { 2719 error = nfs_nget1(vp->v_mount, fhp, 2720 fhsize, &np, LK_NOWAIT); 2721 if (!error) 2722 newvp = NFSTOV(np); 2723 } 2724 if (!error) { 2725 nfs_loadattrcache(&newvp, &fattr, 0, 0); 2726 if (bigenough) { 2727 dp->d_type = 2728 IFTODT(VTTOIF(np->n_vattr->va_type)); 2729 ndp->ni_vp = newvp; 2730 nfs_cache_enter(ndp->ni_dvp, 2731 ndp->ni_vp, cnp); 2732 } 2733 } 2734 error = 0; 2735 } 2736 } else { 2737 /* Just skip over the file handle */ 2738 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2739 i = fxdr_unsigned(int, *tl); 2740 nfsm_adv(nfsm_rndup(i)); 2741 } 2742 if (newvp != NULLVP) { 2743 if (newvp == vp) 2744 vrele(newvp); 2745 else 2746 vput(newvp); 2747 newvp = NULLVP; 2748 } 2749 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2750 more_dirs = fxdr_unsigned(int, *tl); 2751 } 2752 /* 2753 * If at end of rpc data, get the eof boolean 2754 */ 2755 if (!more_dirs) { 2756 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2757 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2758 2759 /* 2760 * kludge: see a comment in nfs_readdirrpc. 2761 */ 2762 2763 if (uiop->uio_resid >= NFS_DIRBLKSIZ) 2764 more_dirs = 0; 2765 } 2766 m_freem(mrep); 2767 } 2768 /* 2769 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ 2770 * by increasing d_reclen for the last record. 2771 */ 2772 if (blksiz > 0) { 2773 left = NFS_DIRFRAGSIZ - blksiz; 2774 memset(uiop->uio_iov->iov_base, 0, left); 2775 dp->d_reclen += left; 2776 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2777 UIO_ADVANCE(uiop, left); 2778 } 2779 2780 /* 2781 * We are now either at the end of the directory or have filled the 2782 * block. 2783 */ 2784 if (bigenough) { 2785 dnp->n_direofoffset = uiop->uio_offset; 2786 dnp->n_flag |= NEOFVALID; 2787 } 2788 nfsmout: 2789 if (newvp != NULLVP) { 2790 if(newvp == vp) 2791 vrele(newvp); 2792 else 2793 vput(newvp); 2794 } 2795 return (error); 2796 } 2797 #endif 2798 2799 /* 2800 * Silly rename. To make the NFS filesystem that is stateless look a little 2801 * more like the "ufs" a remove of an active vnode is translated to a rename 2802 * to a funny looking filename that is removed by nfs_inactive on the 2803 * nfsnode. There is the potential for another process on a different client 2804 * to create the same funny name between the nfs_lookitup() fails and the 2805 * nfs_rename() completes, but... 2806 */ 2807 int 2808 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp, bool dolink) 2809 { 2810 struct sillyrename *sp; 2811 struct nfsnode *np; 2812 int error; 2813 pid_t pid; 2814 2815 cache_purge(dvp); 2816 np = VTONFS(vp); 2817 #ifndef DIAGNOSTIC 2818 if (vp->v_type == VDIR) 2819 panic("nfs: sillyrename dir"); 2820 #endif 2821 sp = kmem_alloc(sizeof(*sp), KM_SLEEP); 2822 sp->s_cred = kauth_cred_dup(cnp->cn_cred); 2823 sp->s_dvp = dvp; 2824 vref(dvp); 2825 2826 /* Fudge together a funny name */ 2827 pid = curlwp->l_proc->p_pid; 2828 memcpy(sp->s_name, ".nfsAxxxx4.4", 13); 2829 sp->s_namlen = 12; 2830 sp->s_name[8] = hexdigits[pid & 0xf]; 2831 sp->s_name[7] = hexdigits[(pid >> 4) & 0xf]; 2832 sp->s_name[6] = hexdigits[(pid >> 8) & 0xf]; 2833 sp->s_name[5] = hexdigits[(pid >> 12) & 0xf]; 2834 2835 /* Try lookitups until we get one that isn't there */ 2836 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2837 curlwp, (struct nfsnode **)0) == 0) { 2838 sp->s_name[4]++; 2839 if (sp->s_name[4] > 'z') { 2840 error = EINVAL; 2841 goto bad; 2842 } 2843 } 2844 if (dolink) { 2845 error = nfs_linkrpc(dvp, vp, sp->s_name, sp->s_namlen, 2846 sp->s_cred, curlwp); 2847 /* 2848 * nfs_request maps NFSERR_NOTSUPP to ENOTSUP. 2849 */ 2850 if (error == ENOTSUP) { 2851 error = nfs_renameit(dvp, cnp, sp); 2852 } 2853 } else { 2854 error = nfs_renameit(dvp, cnp, sp); 2855 } 2856 if (error) 2857 goto bad; 2858 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2859 curlwp, &np); 2860 np->n_sillyrename = sp; 2861 return (0); 2862 bad: 2863 vrele(sp->s_dvp); 2864 kauth_cred_free(sp->s_cred); 2865 kmem_free(sp, sizeof(*sp)); 2866 return (error); 2867 } 2868 2869 /* 2870 * Look up a file name and optionally either update the file handle or 2871 * allocate an nfsnode, depending on the value of npp. 2872 * npp == NULL --> just do the lookup 2873 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2874 * handled too 2875 * *npp != NULL --> update the file handle in the vnode 2876 */ 2877 int 2878 nfs_lookitup(struct vnode *dvp, const char *name, int len, kauth_cred_t cred, struct lwp *l, struct nfsnode **npp) 2879 { 2880 u_int32_t *tl; 2881 char *cp; 2882 int32_t t1, t2; 2883 struct vnode *newvp = (struct vnode *)0; 2884 struct nfsnode *np, *dnp = VTONFS(dvp); 2885 char *bpos, *dpos, *cp2; 2886 int error = 0, ofhlen, fhlen; 2887 #ifndef NFS_V2_ONLY 2888 int attrflag; 2889 #endif 2890 struct mbuf *mreq, *mrep, *md, *mb; 2891 nfsfh_t *ofhp, *nfhp; 2892 const int v3 = NFS_ISV3(dvp); 2893 2894 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2895 nfsm_reqhead(dnp, NFSPROC_LOOKUP, 2896 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2897 nfsm_fhtom(dnp, v3); 2898 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2899 nfsm_request(dnp, NFSPROC_LOOKUP, l, cred); 2900 if (npp && !error) { 2901 nfsm_getfh(nfhp, fhlen, v3); 2902 if (*npp) { 2903 np = *npp; 2904 newvp = NFSTOV(np); 2905 ofhlen = np->n_fhsize; 2906 ofhp = kmem_alloc(ofhlen, KM_SLEEP); 2907 memcpy(ofhp, np->n_fhp, ofhlen); 2908 error = vcache_rekey_enter(newvp->v_mount, newvp, 2909 ofhp, ofhlen, nfhp, fhlen); 2910 if (error) { 2911 kmem_free(ofhp, ofhlen); 2912 m_freem(mrep); 2913 return error; 2914 } 2915 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2916 kmem_free(np->n_fhp, np->n_fhsize); 2917 np->n_fhp = &np->n_fh; 2918 } 2919 #if NFS_SMALLFH < NFSX_V3FHMAX 2920 else if (np->n_fhsize <= NFS_SMALLFH && fhlen > NFS_SMALLFH) 2921 np->n_fhp = kmem_alloc(fhlen, KM_SLEEP); 2922 #endif 2923 memcpy(np->n_fhp, nfhp, fhlen); 2924 np->n_fhsize = fhlen; 2925 vcache_rekey_exit(newvp->v_mount, newvp, 2926 ofhp, ofhlen, np->n_fhp, fhlen); 2927 kmem_free(ofhp, ofhlen); 2928 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2929 vref(dvp); 2930 newvp = dvp; 2931 np = dnp; 2932 } else { 2933 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2934 if (error) { 2935 m_freem(mrep); 2936 return (error); 2937 } 2938 newvp = NFSTOV(np); 2939 } 2940 #ifndef NFS_V2_ONLY 2941 if (v3) { 2942 nfsm_postop_attr(newvp, attrflag, 0); 2943 if (!attrflag && *npp == NULL) { 2944 m_freem(mrep); 2945 vput(newvp); 2946 return (ENOENT); 2947 } 2948 } else 2949 #endif 2950 nfsm_loadattr(newvp, (struct vattr *)0, 0); 2951 } 2952 nfsm_reqdone; 2953 if (npp && *npp == NULL) { 2954 if (error) { 2955 if (newvp) 2956 vput(newvp); 2957 } else 2958 *npp = np; 2959 } 2960 return (error); 2961 } 2962 2963 #ifndef NFS_V2_ONLY 2964 /* 2965 * Nfs Version 3 commit rpc 2966 */ 2967 int 2968 nfs_commit(struct vnode *vp, off_t offset, uint32_t cnt, struct lwp *l) 2969 { 2970 char *cp; 2971 u_int32_t *tl; 2972 int32_t t1, t2; 2973 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2974 char *bpos, *dpos, *cp2; 2975 int error = 0, wccflag = NFSV3_WCCRATTR; 2976 struct mbuf *mreq, *mrep, *md, *mb; 2977 struct nfsnode *np; 2978 2979 KASSERT(NFS_ISV3(vp)); 2980 2981 #ifdef NFS_DEBUG_COMMIT 2982 printf("commit %lu - %lu\n", (unsigned long)offset, 2983 (unsigned long)(offset + cnt)); 2984 #endif 2985 2986 mutex_enter(&nmp->nm_lock); 2987 if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0) { 2988 mutex_exit(&nmp->nm_lock); 2989 return (0); 2990 } 2991 mutex_exit(&nmp->nm_lock); 2992 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2993 np = VTONFS(vp); 2994 nfsm_reqhead(np, NFSPROC_COMMIT, NFSX_FH(1)); 2995 nfsm_fhtom(np, 1); 2996 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2997 txdr_hyper(offset, tl); 2998 tl += 2; 2999 *tl = txdr_unsigned(cnt); 3000 nfsm_request(np, NFSPROC_COMMIT, l, np->n_wcred); 3001 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false); 3002 if (!error) { 3003 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 3004 mutex_enter(&nmp->nm_lock); 3005 if ((nmp->nm_iflag & NFSMNT_STALEWRITEVERF) || 3006 memcmp(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF)) { 3007 memcpy(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF); 3008 error = NFSERR_STALEWRITEVERF; 3009 nmp->nm_iflag |= NFSMNT_STALEWRITEVERF; 3010 } 3011 mutex_exit(&nmp->nm_lock); 3012 } 3013 nfsm_reqdone; 3014 return (error); 3015 } 3016 #endif 3017 3018 /* 3019 * Kludge City.. 3020 * - make nfs_bmap() essentially a no-op that does no translation 3021 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 3022 * (Maybe I could use the process's page mapping, but I was concerned that 3023 * Kernel Write might not be enabled and also figured copyout() would do 3024 * a lot more work than memcpy() and also it currently happens in the 3025 * context of the swapper process (2). 3026 */ 3027 int 3028 nfs_bmap(void *v) 3029 { 3030 struct vop_bmap_args /* { 3031 struct vnode *a_vp; 3032 daddr_t a_bn; 3033 struct vnode **a_vpp; 3034 daddr_t *a_bnp; 3035 int *a_runp; 3036 } */ *ap = v; 3037 struct vnode *vp = ap->a_vp; 3038 int bshift = vp->v_mount->mnt_fs_bshift - vp->v_mount->mnt_dev_bshift; 3039 3040 if (ap->a_vpp != NULL) 3041 *ap->a_vpp = vp; 3042 if (ap->a_bnp != NULL) 3043 *ap->a_bnp = ap->a_bn << bshift; 3044 if (ap->a_runp != NULL) 3045 *ap->a_runp = 1024 * 1024; /* XXX */ 3046 return (0); 3047 } 3048 3049 /* 3050 * Strategy routine. 3051 * For async requests when nfsiod(s) are running, queue the request by 3052 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 3053 * request. 3054 */ 3055 int 3056 nfs_strategy(void *v) 3057 { 3058 struct vop_strategy_args *ap = v; 3059 struct buf *bp = ap->a_bp; 3060 int error = 0; 3061 3062 if ((bp->b_flags & (B_PHYS|B_ASYNC)) == (B_PHYS|B_ASYNC)) 3063 panic("nfs physio/async"); 3064 3065 /* 3066 * If the op is asynchronous and an i/o daemon is waiting 3067 * queue the request, wake it up and wait for completion 3068 * otherwise just do it ourselves. 3069 */ 3070 if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(bp)) 3071 error = nfs_doio(bp); 3072 return (error); 3073 } 3074 3075 /* 3076 * fsync vnode op. Just call nfs_flush() with commit == 1. 3077 */ 3078 /* ARGSUSED */ 3079 int 3080 nfs_fsync(void *v) 3081 { 3082 struct vop_fsync_args /* { 3083 struct vnodeop_desc *a_desc; 3084 struct vnode * a_vp; 3085 kauth_cred_t a_cred; 3086 int a_flags; 3087 off_t offlo; 3088 off_t offhi; 3089 struct lwp * a_l; 3090 } */ *ap = v; 3091 3092 struct vnode *vp = ap->a_vp; 3093 3094 if (vp->v_type != VREG) 3095 return 0; 3096 3097 return (nfs_flush(vp, ap->a_cred, 3098 (ap->a_flags & FSYNC_WAIT) != 0 ? MNT_WAIT : 0, curlwp, 1)); 3099 } 3100 3101 /* 3102 * Flush all the data associated with a vnode. 3103 */ 3104 int 3105 nfs_flush(struct vnode *vp, kauth_cred_t cred, int waitfor, struct lwp *l, 3106 int commit) 3107 { 3108 struct nfsnode *np = VTONFS(vp); 3109 int error; 3110 int flushflags = PGO_ALLPAGES|PGO_CLEANIT|PGO_SYNCIO; 3111 UVMHIST_FUNC("nfs_flush"); UVMHIST_CALLED(ubchist); 3112 3113 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 3114 error = VOP_PUTPAGES(vp, 0, 0, flushflags); 3115 if (np->n_flag & NWRITEERR) { 3116 error = np->n_error; 3117 np->n_flag &= ~NWRITEERR; 3118 } 3119 UVMHIST_LOG(ubchist, "returning %d", error,0,0,0); 3120 return (error); 3121 } 3122 3123 /* 3124 * Return POSIX pathconf information applicable to nfs. 3125 * 3126 * N.B. The NFS V2 protocol doesn't support this RPC. 3127 */ 3128 /* ARGSUSED */ 3129 int 3130 nfs_pathconf(void *v) 3131 { 3132 struct vop_pathconf_args /* { 3133 struct vnode *a_vp; 3134 int a_name; 3135 register_t *a_retval; 3136 } */ *ap = v; 3137 struct nfsv3_pathconf *pcp; 3138 struct vnode *vp = ap->a_vp; 3139 struct mbuf *mreq, *mrep, *md, *mb; 3140 int32_t t1, t2; 3141 u_int32_t *tl; 3142 char *bpos, *dpos, *cp, *cp2; 3143 int error = 0, attrflag; 3144 #ifndef NFS_V2_ONLY 3145 struct nfsmount *nmp; 3146 unsigned int l; 3147 u_int64_t maxsize; 3148 #endif 3149 const int v3 = NFS_ISV3(vp); 3150 struct nfsnode *np = VTONFS(vp); 3151 3152 switch (ap->a_name) { 3153 /* Names that can be resolved locally. */ 3154 case _PC_PIPE_BUF: 3155 *ap->a_retval = PIPE_BUF; 3156 break; 3157 case _PC_SYNC_IO: 3158 *ap->a_retval = 1; 3159 break; 3160 /* Names that cannot be resolved locally; do an RPC, if possible. */ 3161 case _PC_LINK_MAX: 3162 case _PC_NAME_MAX: 3163 case _PC_CHOWN_RESTRICTED: 3164 case _PC_NO_TRUNC: 3165 if (!v3) { 3166 error = EINVAL; 3167 break; 3168 } 3169 nfsstats.rpccnt[NFSPROC_PATHCONF]++; 3170 nfsm_reqhead(np, NFSPROC_PATHCONF, NFSX_FH(1)); 3171 nfsm_fhtom(np, 1); 3172 nfsm_request(np, NFSPROC_PATHCONF, 3173 curlwp, curlwp->l_cred); /* XXX */ 3174 nfsm_postop_attr(vp, attrflag, 0); 3175 if (!error) { 3176 nfsm_dissect(pcp, struct nfsv3_pathconf *, 3177 NFSX_V3PATHCONF); 3178 switch (ap->a_name) { 3179 case _PC_LINK_MAX: 3180 *ap->a_retval = 3181 fxdr_unsigned(register_t, pcp->pc_linkmax); 3182 break; 3183 case _PC_NAME_MAX: 3184 *ap->a_retval = 3185 fxdr_unsigned(register_t, pcp->pc_namemax); 3186 break; 3187 case _PC_CHOWN_RESTRICTED: 3188 *ap->a_retval = 3189 (pcp->pc_chownrestricted == nfs_true); 3190 break; 3191 case _PC_NO_TRUNC: 3192 *ap->a_retval = 3193 (pcp->pc_notrunc == nfs_true); 3194 break; 3195 } 3196 } 3197 nfsm_reqdone; 3198 break; 3199 case _PC_FILESIZEBITS: 3200 #ifndef NFS_V2_ONLY 3201 if (v3) { 3202 nmp = VFSTONFS(vp->v_mount); 3203 if ((nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 3204 if ((error = nfs_fsinfo(nmp, vp, 3205 curlwp->l_cred, curlwp)) != 0) /* XXX */ 3206 break; 3207 for (l = 0, maxsize = nmp->nm_maxfilesize; 3208 (maxsize >> l) > 0; l++) 3209 ; 3210 *ap->a_retval = l + 1; 3211 } else 3212 #endif 3213 { 3214 *ap->a_retval = 32; /* NFS V2 limitation */ 3215 } 3216 break; 3217 default: 3218 error = genfs_pathconf(ap); 3219 break; 3220 } 3221 3222 return (error); 3223 } 3224 3225 /* 3226 * NFS advisory byte-level locks. 3227 */ 3228 int 3229 nfs_advlock(void *v) 3230 { 3231 struct vop_advlock_args /* { 3232 struct vnode *a_vp; 3233 void *a_id; 3234 int a_op; 3235 struct flock *a_fl; 3236 int a_flags; 3237 } */ *ap = v; 3238 struct nfsnode *np = VTONFS(ap->a_vp); 3239 3240 return lf_advlock(ap, &np->n_lockf, np->n_size); 3241 } 3242 3243 /* 3244 * Print out the contents of an nfsnode. 3245 */ 3246 int 3247 nfs_print(void *v) 3248 { 3249 struct vop_print_args /* { 3250 struct vnode *a_vp; 3251 } */ *ap = v; 3252 struct vnode *vp = ap->a_vp; 3253 struct nfsnode *np = VTONFS(vp); 3254 3255 printf("tag VT_NFS, fileid %lld fsid 0x%llx", 3256 (unsigned long long)np->n_vattr->va_fileid, 3257 (unsigned long long)np->n_vattr->va_fsid); 3258 if (vp->v_type == VFIFO) 3259 VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v); 3260 printf("\n"); 3261 return (0); 3262 } 3263 3264 /* 3265 * nfs unlock wrapper. 3266 */ 3267 int 3268 nfs_unlock(void *v) 3269 { 3270 struct vop_unlock_args /* { 3271 struct vnode *a_vp; 3272 int a_flags; 3273 } */ *ap = v; 3274 struct vnode *vp = ap->a_vp; 3275 3276 /* 3277 * VOP_UNLOCK can be called by nfs_loadattrcache 3278 * with v_data == 0. 3279 */ 3280 if (VTONFS(vp)) { 3281 nfs_delayedtruncate(vp); 3282 } 3283 3284 return genfs_unlock(v); 3285 } 3286 3287 /* 3288 * nfs special file access vnode op. 3289 * Essentially just get vattr and then imitate iaccess() since the device is 3290 * local to the client. 3291 */ 3292 int 3293 nfsspec_access(void *v) 3294 { 3295 struct vop_access_args /* { 3296 struct vnode *a_vp; 3297 accmode_t a_accmode; 3298 kauth_cred_t a_cred; 3299 struct lwp *a_l; 3300 } */ *ap = v; 3301 struct vattr va; 3302 struct vnode *vp = ap->a_vp; 3303 int error; 3304 3305 error = VOP_GETATTR(vp, &va, ap->a_cred); 3306 if (error) 3307 return (error); 3308 3309 /* 3310 * Disallow write attempts on filesystems mounted read-only; 3311 * unless the file is a socket, fifo, or a block or character 3312 * device resident on the filesystem. 3313 */ 3314 if ((ap->a_accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3315 switch (vp->v_type) { 3316 case VREG: 3317 case VDIR: 3318 case VLNK: 3319 return (EROFS); 3320 default: 3321 break; 3322 } 3323 } 3324 3325 return kauth_authorize_vnode(ap->a_cred, KAUTH_ACCESS_ACTION( 3326 ap->a_accmode, va.va_type, va.va_mode), vp, NULL, genfs_can_access( 3327 vp, ap->a_cred, va.va_uid, va.va_gid, va.va_mode, NULL, 3328 ap->a_accmode)); 3329 } 3330 3331 /* 3332 * Read wrapper for special devices. 3333 */ 3334 int 3335 nfsspec_read(void *v) 3336 { 3337 struct vop_read_args /* { 3338 struct vnode *a_vp; 3339 struct uio *a_uio; 3340 int a_ioflag; 3341 kauth_cred_t a_cred; 3342 } */ *ap = v; 3343 struct nfsnode *np = VTONFS(ap->a_vp); 3344 3345 /* 3346 * Set access flag. 3347 */ 3348 np->n_flag |= NACC; 3349 getnanotime(&np->n_atim); 3350 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap)); 3351 } 3352 3353 /* 3354 * Write wrapper for special devices. 3355 */ 3356 int 3357 nfsspec_write(void *v) 3358 { 3359 struct vop_write_args /* { 3360 struct vnode *a_vp; 3361 struct uio *a_uio; 3362 int a_ioflag; 3363 kauth_cred_t a_cred; 3364 } */ *ap = v; 3365 struct nfsnode *np = VTONFS(ap->a_vp); 3366 3367 /* 3368 * Set update flag. 3369 */ 3370 np->n_flag |= NUPD; 3371 getnanotime(&np->n_mtim); 3372 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap)); 3373 } 3374 3375 /* 3376 * Close wrapper for special devices. 3377 * 3378 * Update the times on the nfsnode then do device close. 3379 */ 3380 int 3381 nfsspec_close(void *v) 3382 { 3383 struct vop_close_args /* { 3384 struct vnode *a_vp; 3385 int a_fflag; 3386 kauth_cred_t a_cred; 3387 struct lwp *a_l; 3388 } */ *ap = v; 3389 struct vnode *vp = ap->a_vp; 3390 struct nfsnode *np = VTONFS(vp); 3391 struct vattr vattr; 3392 3393 if (np->n_flag & (NACC | NUPD)) { 3394 np->n_flag |= NCHG; 3395 if (vrefcnt(vp) == 1 && 3396 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3397 vattr_null(&vattr); 3398 if (np->n_flag & NACC) 3399 vattr.va_atime = np->n_atim; 3400 if (np->n_flag & NUPD) 3401 vattr.va_mtime = np->n_mtim; 3402 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3403 } 3404 } 3405 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 3406 } 3407 3408 /* 3409 * Read wrapper for fifos. 3410 */ 3411 int 3412 nfsfifo_read(void *v) 3413 { 3414 struct vop_read_args /* { 3415 struct vnode *a_vp; 3416 struct uio *a_uio; 3417 int a_ioflag; 3418 kauth_cred_t a_cred; 3419 } */ *ap = v; 3420 struct nfsnode *np = VTONFS(ap->a_vp); 3421 3422 /* 3423 * Set access flag. 3424 */ 3425 np->n_flag |= NACC; 3426 getnanotime(&np->n_atim); 3427 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap)); 3428 } 3429 3430 /* 3431 * Write wrapper for fifos. 3432 */ 3433 int 3434 nfsfifo_write(void *v) 3435 { 3436 struct vop_write_args /* { 3437 struct vnode *a_vp; 3438 struct uio *a_uio; 3439 int a_ioflag; 3440 kauth_cred_t a_cred; 3441 } */ *ap = v; 3442 struct nfsnode *np = VTONFS(ap->a_vp); 3443 3444 /* 3445 * Set update flag. 3446 */ 3447 np->n_flag |= NUPD; 3448 getnanotime(&np->n_mtim); 3449 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap)); 3450 } 3451 3452 /* 3453 * Close wrapper for fifos. 3454 * 3455 * Update the times on the nfsnode then do fifo close. 3456 */ 3457 int 3458 nfsfifo_close(void *v) 3459 { 3460 struct vop_close_args /* { 3461 struct vnode *a_vp; 3462 int a_fflag; 3463 kauth_cred_t a_cred; 3464 struct lwp *a_l; 3465 } */ *ap = v; 3466 struct vnode *vp = ap->a_vp; 3467 struct nfsnode *np = VTONFS(vp); 3468 struct vattr vattr; 3469 3470 if (np->n_flag & (NACC | NUPD)) { 3471 struct timespec ts; 3472 3473 getnanotime(&ts); 3474 if (np->n_flag & NACC) 3475 np->n_atim = ts; 3476 if (np->n_flag & NUPD) 3477 np->n_mtim = ts; 3478 np->n_flag |= NCHG; 3479 if (vrefcnt(vp) == 1 && 3480 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3481 vattr_null(&vattr); 3482 if (np->n_flag & NACC) 3483 vattr.va_atime = np->n_atim; 3484 if (np->n_flag & NUPD) 3485 vattr.va_mtime = np->n_mtim; 3486 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3487 } 3488 } 3489 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 3490 } 3491
Indexes created Wed Sep 24 05:09:52 GMT 2025